BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC
N-30D, 2000-08-30
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--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISOR
--------------------------------------------------------------------------------


                                                                   July 31, 2000


Dear Shareholder:

     In the first half of the year, fears of an open-ended  tightening policy by
the Federal Reserve peaked in May, which resulted in a subsequent  relief in the
market  as the U.S.  economy  seemed to  decelerate  significantly.  During  the
period, the Federal Reserve tightened short-term rates by 1.00% in an attempt to
engineer a "soft landing" for the U.S.  economy.  In the first six months of the
new millennium we have witnessed  unprecedented  volatility in both the Treasury
yield curve and the spread sectors.  The Treasury curve inverted  sharply in the
first quarter,  but as weak economic data emerged in the second quarter,  market
participants  embraced an economic  "soft  landing"  scenario  causing the yield
curve to steepen.  The downward revision in growth  expectations  allowed spread
sectors to rally in the month of June, but year-to-date  their performance still
trails Treasuries.

     While  fears  of a  hawkish  Federal  Reserve  and  consequent  risks  of a
"hard-landing"  may not  materialize  immediately,  the risks are skewed in that
direction.  A longer period of subdued financial market performance is necessary
to  enable  the  labor  markets  to  build  up  slack,  which  is  an  important
pre-condition for the Fed to achieve its goal.

     This report contains a summary of market  conditions during the semi-annual
period and a review of portfolio  strategy by your Trust's  managers in addition
to the  Trust's  unaudited  financial  statements  and a  detailed  list  of the
portfolio's  holdings.  Continued  thanks for your  confidence in BlackRock.  We
appreciate the opportunity to help you achieve your long-term investment goals.

Sincerely,


/s/ Laurence D. Fink                               /s/ Ralph L. Schlosstein
--------------------                               ------------------------
Laurence D. Fink                                   Ralph L. Schlosstein
Chairman                                           President

                                       1
<PAGE>


                                                                   July 31, 2000


Dear Shareholder:


     We are  pleased  to  present  the  unaudited  semi-annual  report  for  The
BlackRock  Insured  Municipal  2008 Term Trust Inc.  ("the  Trust")  for the six
months ended June 30, 2000. We would like to take this opportunity to review the
Trust's   stock  price  and  net  asset  value  (NAV)   performance,   summarize
developments in the fixed income markets and discuss recent portfolio management
activity.

     The Trust is a diversified,  actively  managed  closed-end  bond fund whose
shares are traded on the New York Stock  Exchange  under the symbol  "BRM".  The
Trust's  investment  objective  is to  manage  a  portfolio  of  municipal  debt
securities  that  will  return  $15 per share (an  amount  equal to the  Trust's
initial public offering price) to investors on or about December 31, 2008, while
providing high current income exempt from regular  federal income tax. The Trust
seeks to achieve this  objective by investing in high credit  quality  ("AAA" or
insured to "AAA")  tax-exempt  general  obligation  and revenue  bonds issued by
city, county and state municipalities throughout the United States.

     The table below  summarizes  the changes in the Trust's stock price and NAV
over the past six months:

                           -----------------------------------------------------
                              6/30/00   12/31/99    CHANGE     HIGH       LOW
--------------------------------------------------------------------------------
  STOCK PRICE                 $14.125    $13.75       2.73%   $14.125   $13.375
--------------------------------------------------------------------------------
  NET ASSET VALUE (NAV)       $16.03     $16.00       0.19%   $16.08    $15.54
--------------------------------------------------------------------------------


THE FIXED INCOME MARKETS

     The dynamic  expansion of the U.S. economy  continues  undaunted by Federal
Reserve Chairman Greenspan's attempt to brake the economy,  short of stalling it
into a recession. The labor markets remain tight, growth remains strong with 5%+
annualized  growth  rates  and  inflation  pressures  continue  to be  offset by
increased  productivity.  However,  the Fed remains cautious,  in their February
minutes it was noted that: "Other members  acknowledged that the Committee might
need to move more aggressively at a later meeting should imbalances  continue to
build and  inflation  expectations  clearly  begin to pick  up." At the  Federal
Reserve meeting in November, February and March the Fed raised the discount rate
by 0.25%  at each  meeting  and a 0.50%  increase  was made in May to bring  the
current discount rate to 6.50%.

     The Treasury Yield curve  experienced a complex set of dynamics,  which has
inverted  the curve and may  continue  to invert  the curve for the  foreseeable
future.  The yields on the short-end of the curve  increased  sharply during the
period in response to three Federal  Reserve  increases to the discount rate and
perceived future Fed actions in the coming months.  The long-end of the curve is
reacting to the  "official"  announcement  that the  Treasury  will buy back $30
billion  of  Treasuries  with  maturities  ranging  from 10 to 30 years.  With a
decreasing supply of available  Treasuries,  a balanced budget, and an unchanged
demand for longer  maturity  Treasuries,  we would  anticipate this condition to
continue.  This condition is further augmented by Treasury auction activity,  as
they reduce the  available  bonds on the long end of the curve they  continue to
add supply in the 1-10 year range through periodic auctions. For the semi-annual
period,  the yield of the  10-year  Treasury  security  declined  from  6.44% on
December 31, 1999 to 6.03% on June 30, 2000.

     Municipal bonds  outperformed  the taxable  domestic bond market during the
past six months,  returning  4.49% (as measured by the LEHMAN  MUNICIPAL  INDEX)
versus the LEHMAN AGGREGATE INDEX'S 3.98% on a pre-tax basis. Overall, the tone

                                       2
<PAGE>


in the  market  during  the  period  was  extremely  positive  as the  result of
continued strong demand from individual/retail investors coupled with a slowdown
in new issuance.  During 1999, households increased their holdings of individual
municipal  bonds  by over $40  billion  while  mutual  funds  saw net  outflows.
Offsetting the large amount of mutual fund outflows  during the first quarter of
2000 was a 22% decline in overall new  municipal  bond issuance YTD for the same
period, led by a 68% drop in refunding volume.  Refunding volume was down due to
the relatively higher interest rates  experienced  during the first half of 2000
when compared to the first half of 1999,  while new money  issuance has declined
because the strong economy has led to full coffers at most municipalities.

THE TRUST'S PORTFOLIO AND INVESTMENT STRATEGY

     The Trust's portfolio is actively managed to diversify  exposure to various
sectors,  issuers,  revenue sources and security types.  BlackRock's  investment
strategy  emphasizes  a  relative  value  approach,  which  allows  the Trust to
capitalize upon changing  market  conditions by rotating  municipal  sectors and
coupons.  Additionally,  the Trust  emphasizes  securities  whose maturity dates
match the termination date of the Trust.

     Over the period,  trading activity in the Trust remained relatively low, as
many of the  securities  in the Trust's  portfolio  continued to trade at prices
above current cost.  As trading  activity that results in the Trust  realizing a
capital gain could require a taxable  distribution,  we continue to believe that
waiting to restructure  the portfolio in a higher  interest rate  environment is
the most  prudent  portfolio  management  strategy.  We reduced our  position in
Hospital Bonds to add to the county,  city and state general  obligation sector.
At  present,  we are  confident  that the Trust is on  schedule  to achieve  its
primary  investment  objective of returning $15 per share upon  termination  and
will continue to seek investment opportunities in the municipal market.

     During the period the Trust  issued  $65,000,000  in  additional  preferred
shares.  The Trust  employs  leverage  to  enhance  its income by  borrowing  at
short-term  municipal rates and investing the proceeds in longer maturity issues
that have higher yields.  The degree to which the Trust can benefit from its use
of leverage  may affect its ability to pay high monthly  income.  As of June 30,
2000, the Trust's leverage amount was 38% of total assets.

     The  following  chart  compares  the Trust's  current and December 31, 1999
asset composition:

--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
--------------------------------------------------------------------------------
     SECTOR                           JUNE 30, 2000    DECEMBER 31, 1999
--------------------------------------------------------------------------------
     County, City & State                  25%                22%
--------------------------------------------------------------------------------
     Utility/Power                         21%                22%
--------------------------------------------------------------------------------
     Hospital                              12%                15%
--------------------------------------------------------------------------------
     Education                             11%                11%
--------------------------------------------------------------------------------
     Transportation                         7%                 6%
--------------------------------------------------------------------------------
     Lease Revenue                          5%                 6%
--------------------------------------------------------------------------------
     Water & Sewer                          5%                 6%
--------------------------------------------------------------------------------
     Tax Revenue                            5%                 5%
--------------------------------------------------------------------------------
     Special District                       5%                 3%
--------------------------------------------------------------------------------
     Housing                                3%                 3%
--------------------------------------------------------------------------------
     Industrial & Pollution Control         1%                 1%
--------------------------------------------------------------------------------

                                       3
<PAGE>


     We look  forward to managing  the Trust to benefit  from the  opportunities
available in the fixed income markets and to meet its investment objectives.  We
thank you for your investment in the BlackRock Insured Municipal 2008 Term Trust
Inc.  Please feel free to contact our marketing  center at (800) 227-7BFM (7236)
if you have specific questions which were not addressed in this report.


Sincerely,


/s/ Robert S. Kapito                    /s/ Kevin M. Klingert
--------------------                    ---------------------
Robert S. Kapito                        Kevin M. Klingert
Vice Chairman and Portfolio Manager     Managing Director and Portfolio Manager
BlackRock Advisors, Inc.                BlackRock Advisors, Inc.


--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
--------------------------------------------------------------------------------
   Symbol on New York Stock Exchange:                                 BRM
--------------------------------------------------------------------------------
   Initial Offering Date:                                     September 18, 1992
--------------------------------------------------------------------------------
   Closing Stock Price as of 6/30/00:                               $14.125
--------------------------------------------------------------------------------
   Net Asset Value as of 6/30/00:                                   $16.03
--------------------------------------------------------------------------------
   Yield on Closing Stock Price as of 6/30/00 ($14.125)(1):           5.63%
--------------------------------------------------------------------------------
   Current Monthly Distribution per Common Share(2):              $0.06625
--------------------------------------------------------------------------------
   Current Annualized Distribution per Common Share(2):           $0.79500
--------------------------------------------------------------------------------

----------

(1)  Yield on  Closing  Stock  Price  is  calculated  by  dividing  the  current
     annualized distribution per share by the closing stock price per share.

(2)  Distribution is not constant and is subject to change.

                                       4
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
PORTFOLIO OF INVESTMENTS JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
           PRINCIPAL                                                                                   OPTION
            AMOUNT                                                                                       CALL              VALUE
  RATING*    (000)                                 DESCRIPTION                                        PROVISIONS+         (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>      <C>         <C>                                                                            <C>                 <C>
                     LONG-TERM INVESTMENTS--160.4%
                     ALABAMA--0.3%
  AAA    $  1,905    Mobile Impvt. Wt., Zero Coupon, 8/15/08, MBIA .............................    8/02 @ 71.587      $   1,222,591
                                                                                                                        ------------
                     ARIZONA--0.6%
  AAA       4,000    Chandler, G.O., Zero Coupon, 7/01/08, FGIC ................................     No Opt. Call          2,655,880
                                                                                                                        ------------
                     CALIFORNIA--0.5%
   AAA      1,890    California Hlth. Fac. Fin. Auth. Rev., Marin Gen. Hosp.,
                       Ser. A, 5.75%, 8/01/09, FSA .............................................      8/03 @ 102           1,965,789
                                                                                                                           ---------
                     COLORADO--12.3%
  AAA       2,000    E-470 Pub. Hwy. Auth. Rev., Ser. B, Zero Coupon, 9/01/11, MBIA ............     No Opt. Call          1,095,460
  AAA      30,205++  Jefferson Cnty. Sch. Dist. No. R-001, G.O., 6.25%, 12/15/02, AMBAC ........         N/A              31,591,410
  AAA       6,965    Regl. Transn. Dist. C.O.P., Transit Vehicles Proj. Ser. A,
                       5.00%, 6/01/08, MBIA ....................................................      6/07 @ 101           6,942,433
  AAA      13,285++  Univ. of Colorado, Hosp. Auth. Rev., Ser. A, 6.25%, 11/15/02, AMBAC .......         N/A              13,998,139
                                                                                                                        ------------
                                                                                                                          53,627,442
                                                                                                                        ------------
                     DISTRICT OF COLUMBIA--8.5%
                     Dist. of Columbia, G.O.,
  AAA       2,800      Ser. B, 5.50%, 6/01/09, FSA .............................................    No Opt. Call           2,863,616
  AAA      17,950++    Ser. B, 6.30%, 6/01/02, MBIA ............................................        N/A               18,801,369
  AAA      10,000      Ser. B-1, 5.50%, 6/01/08, AMBAC .........................................    No Opt. Call          10,231,400
  AAA         115++    Ser. E, 5.875%, 6/01/03, MBIA ...........................................        N/A                  120,375
  AAA       2,955      Ser. E, 5.875%, 6/01/08, MBIA ...........................................     6/03 @ 102            3,046,782
  AAA       2,000    Dist. of Columbia, Hosp. Rev., Children's Hosp.,
                       Ser. A, 6.25%, 7/15/08, FGIC ............................................      7/02 @ 102           2,072,860
                                                                                                                        ------------
                                                                                                                          37,136,402
                                                                                                                        ------------
                     GEORGIA--2.9%
  AAA       7,000++  Atlanta, C.O.P., Pretrial Det. Ctr., 6.25%, 12/01/02, MBIA ................         N/A               7,380,100
  AAA       5,000    Georgia St., G.O., Ser. E, 5.25%, 2/01/10 .................................     No Opt. Call          5,087,700
                                                                                                                        ------------
                                                                                                                          12,467,800
                                                                                                                        ------------
                     HAWAII--1.0%
  AAA       4,260    Honolulu Cnty., G.O., Ser. A, 5.80%, 1/01/07, FGIC ........................     No Opt. Call          4,441,433
                                                                                                                        ------------
                     ILLINOIS--15.5%
  AAA      14,205    Chicago O' Hare Intl. Arprt. Rev., Ser. A, 6.25%, 1/01/08, MBIA ...........      1/05 @ 102          15,073,210
  AAA       3,105    Chicago Pub. Bldg. Comm. Bldg. Rev., Ser. A, Zero Coupon, 1/01/07, MBIA ...         ETM               2,210,232
                     Chicago Sch. Fin. Auth., G.O., Ser. A, FGIC,
  AAA      13,000      6.25%, 6/01/07 ..........................................................      6/02 @ 102          13,524,940
  AAA       9,150      6.25%, 6/01/09 ..........................................................      6/02 @ 102           9,534,758
   Aaa      5,980    Cook Cnty. High Sch. Dist. No. 201-J, Sterling Morton Twnsp.,
                       Zero Coupon, 12/01/09, FGIC .............................................     No Opt. Call          3,622,564
  AAA       8,985    Du Page Cnty. Fst. Presv. Dist., Zero Coupon, 11/01/08 ....................     No Opt. Call          5,784,453
  AAA      11,000++  Illinois Hlth. Fac. Auth. Rev., Alexian Med. Ctr. Proj.,
                       Ser. A, 6.35%, 1/01/02, MBIA ............................................         N/A              11,474,100
                     Met. Pier & Expo. Auth. Ded. St. Tax Rev. Auth., FGIC,
  AAA       1,570      Ser. A, Zero Coupon, 6/15/08 ............................................         ETM               1,029,904
  AAA       8,600      Ser. A, Zero Coupon, 6/15/08 ............................................     No Opt. Call          5,561,362
                                                                                                                        ------------
                                                                                                                          67,815,523
                                                                                                                        ------------
                     INDIANA        --2.4%
                     Indiana Hlth. Fac. Fin. Auth. Hosp. Rev. & Impvt., Ancilla Sys. Inc., MBIA,
   NR       1,805++  Ser. A, 6.25%, 7/01/02 ....................................................         N/A               1,891,062
   NR       3,860    Ser. A, 6.25%, 7/01/08 ....................................................      7/02 @ 102           4,010,424
   NR       1,385++  Ser. B, 6.25%, 7/01/02 ....................................................         N/A               1,451,037
   NR       2,965    Ser. B, 6.25%, 7/01/08 ....................................................      7/02 @ 102           3,080,546
                                                                                                                        ------------
                                                                                                                          10,433,069
                                                                                                                        ------------
</TABLE>

                       See Notes to Financial Statements.

                                       5
<PAGE>


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
           PRINCIPAL                                                                                   OPTION
            AMOUNT                                                                                       CALL              VALUE
  RATING*    (000)                                 DESCRIPTION                                        PROVISIONS+         (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>      <C>         <C>                                                                            <C>                <C>
                     IOWA--1.0%
  AAA    $    305    Iowa Fin. Auth., Sngl. Fam. Mtge. Rev., Ser. F, 6.35%, 7/01/09, AMBAC .....      1/03 @ 102        $    312,347
  AAA       4,195    Muscatine, Elec. Rev., 5.00%, 1/01/08, FSA ................................      1/00 @ 100           4,171,634
                                                                                                                        ------------
                                                                                                                           4,483,981
                                                                                                                        ------------
                     KENTUCKY--0.6%
  AAA       3,890    Owensboro, Elec. Lt. & Pwr. Rev., Ser. B, Zero Coupon, 1/01/09, AMBAC .....     No Opt. Call          2,488,589
                                                                                                                        ------------
                     LOUISIANA--1.2%
   AAA      5,000++  Louisiana Pub. Fac. Auth. Hosp. Rev., Lafayette Gen. Med. Ctr. Proj.,
                       6.30%, 10/01/02, FSA ....................................................         N/A               5,254,350
                                                                                                                        ------------
                     MASSACHUSETTS--4.9%
  AAA       4,465++  Chelsea, Sch. Proj. Loan, 6.00%, 6/15/04, AMBAC ...........................         N/A               4,744,196
                     Massachusetts Bay Trans. Auth. Rev., Ser. B, MBIA,
  AAA         200++    6.00%, 3/01/03 ..........................................................         N/A                 210,038
  AAA       5,800      6.00%, 3/01/10 ..........................................................      3/03 @ 102           6,020,690
  AAA      10,000    Massachusetts St. Hsg. Fin. Agcy. Hsg. Proj.,
                       Ser. A, 5.95%, 10/01/08, AMBAC ..........................................      4/03 @ 102          10,255,800
                                                                                                                        ------------
                                                                                                                          21,230,724
                                                                                                                        ------------
                     MICHIGAN--4.6%
                     Lake Orion, Cmnty. Sch. Dist., AMBAC,
  AAA       3,290++    6.60%, 5/01/05 ..........................................................         N/A               3,568,005
  AAA       3,285++    6.70%, 5/01/05 ..........................................................         N/A               3,576,577
  AAA       8,920++  Michigan St. Bldg. Auth. Rev., Fac. Proj.,
                       Ser. IIA, 6.25%, 10/01/02, AMBAC ........................................         N/A               9,383,929
  AAA       3,400    Wyandotte, Elec. Rev., 6.25%, 10/01/08, MBIA ..............................     No Opt. Call          3,624,468
                                                                                                                        ------------
                                                                                                                          20,152,979
                                                                                                                        ------------
                     MISSOURI--1.7%
   AAA      7,350    Kansas City, Sch. Dist. Bldg. Corp. Leasehold Rev., Cap. Impvts. Proj.,
                       Ser. A, 6.50%, 2/01/08, FGIC ............................................      2/01 @ 102           7,558,299
                                                                                                                        ------------
                     NEVADA--3.9%
  AAA       6,490++  Clark Cnty. Fld. Ctrl., 6.30%, 11/01/01, AMBAC ............................         N/A               6,691,969
                     Washoe Cnty. Arpt. Auth. Rev., Ser. B, MBIA,
  AAA       3,135      5.70%, 7/01/07 ..........................................................      7/03 @ 102           3,222,686
  AAA       2,645      5.75%, 7/01/08 ..........................................................      7/03 @ 102           2,720,038
  AAA       4,135++  Washoe Cnty. Sch. Dist., G.O., Ser. A, 6.20%, 10/01/02, AMBAC .............         N/A               4,303,915
                                                                                                                        ------------
                                                                                                                         16,938,608
                                                                                                                        ------------
                     NEW JERSEY--13.1%
  AAA      30,275    New Jersey Econ. Dev. Auth., Mkt. Trans. Fac. Rev.,
                       Ser. A, 5.80%, 7/01/08, MBI  7/04 @ 102          31,715,787
                     New Jersey St. G.O., Ser. D, MBIA,
  AAA       8,370++    6.00%, 2/15/03 ..........................................................         N/A               8,775,694
  AAA      16,125      6.00%, 2/15/09 ..........................................................      2/03 @ 102          16,807,410
                                                                                                                        ------------
                                                                                                                          57,298,891
                                                                                                                        ------------
                     NEW YORK--12.7%
                     New York City G.O., MBIA,
  AAA       5,000      Ser. E, 6.125%, 8/01/06 .................................................     No Opt. Call          5,311,750
  AAA      15,500      Ser. E, 6.20%, 8/01/07 ..................................................     No Opt. Call         16,604,840
  AAA       5,000      Ser. G, 5.75%, 2/01/08 ..................................................     2/06 @ 101.5          5,224,250
  AAA      15,915    New York St., G.O., Ser. F, 5.25%, 9/15/09, MBIA ..........................      9/08 @ 101          16,172,505
                     New York St. Environ. Fac. Corp., P.C.R., Ser. D,
  AAA       5,945      6.50%, 5/15/07 ..........................................................     11/04 @ 102           6,400,208
  AAA       2,245      6.50%, 11/15/07 .........................................................     11/04 @ 102           2,416,900
   AAA      3,395    New York St. Thruway Auth. Svc. Contract Rev., Local Hwy. & Brdg. Ser. A,
                       5.40%, 1/01/09, MBIA ....................................................      1/05 @ 102           3,463,273
                                                                                                                        ------------
                                                                                                                          55,593,726
                                                                                                                        ------------
</TABLE>

                       See Notes to Financial Statements.

                                       6
<PAGE>


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
           PRINCIPAL                                                                                   OPTION
            AMOUNT                                                                                       CALL              VALUE
  RATING*    (000)                                 DESCRIPTION                                        PROVISIONS+         (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>      <C>         <C>                                                                            <C>                 <C>
                     NORTH CAROLINA--8.5%
  AAA    $  1,000++  Cumberland Cnty. C.O.P., Civic Ctr. Proj., Ser. A, 6.375%, 12/01/04, AMBAC          N/A            $  1,081,750
                     North Carolina Eastn. Mun. Pwr. Agcy. Sys. Rev., Ser. B,
  AAA      13,500      6.125%, 1/01/09, FGIC ...................................................     No Opt. Call         14,274,090
  AAA       5,000      7.00%, 1/01/08, CAPMAC ..................................................     No Opt. Call          5,546,250
  AAA      14,675      7.25%, 1/01/07, CAPMAC ..................................................     No Opt. Call         16,347,070
                                                                                                                        ------------
                                                                                                                          37,249,160
                                                                                                                        ------------
                     NORTH DAKOTA--1.1%
  AAA       4,450++  Bismark Hosp. Rev., St. Alexius Med. Ctr., 6.90%, 5/01/01, AMBAC ..........         N/A               4,623,728
                                                                                                                        ------------
                     OHIO--2.3%
  AAA       2,410++  Cleveland, G.O., 6.40%, 11/15/04, MBIA ....................................         N/A               2,602,993
  AAA       6,095    Hamilton City, Elec. Sys. Rev., Ser. A, 6.125%, 10/15/08, FGIC ............     10/02 @ 102           6,365,191
  AAA       1,000++  Ohio St. Bldg. Auth. Fac. Rev., Juvenile Correctional Proj.,
                       6.50%, 10/01/04, AMBAC ..................................................         N/A               1,082,340
                                                                                                                        ------------
                                                                                                                          10,050,524
                                                                                                                        ------------
                     PENNSYLVANIA--13.3%
  AAA       4,000    Allegheny Cnty. Hosp. Dev. Auth. Rev., Magee Women's Hosp.,
                       6.25%, 10/01/08, FGIC ...................................................     10/02 @ 102           4,186,200
  AAA      15,000    Dauphin Cnty. Gen. Auth. Hosp. Rev., HAPSCO-Western Pennsylvania Hosp. Proj.,
                       6.25%, 7/01/08, MBIA ....................................................      7/02 @ 102          15,657,000
  AAA       6,600    Erie Cnty. Hosp. Auth. Rev., St. Vincent Hlth. Ctr. Proj.,
                       Ser. A, 6.25%, 7/01/08, MBIA ............................................      7/02 @ 102           6,889,080
  AAA       3,500    Indiana Cnty. Indl. Dev. Auth. P.C.R., New York St. Elec. & Gas  Corp.,
                       Ser. A, 6.00%, 6/01/06, MBIA ............................................     No Opt. Call          3,690,715
  AAAA      6,500    Pennsylvania Hsg. Fin. Agcy. Rev., Rental Hsg.,
                       Ser. C, 6.25%, 7/01/07, FNMA ............................................      7/02 @ 102           6,701,370
  AAA       7,450++  Pennsylvania St., G.O., Ser. A, 6.50%, 11/01/01, FGIC .....................         N/A               7,740,625
  AAA       1,500    Philadelphia, Gas Wks. Rev., 5.25%, 7/01/08, FSA ..........................     No Opt. Call          1,520,580
  AAA      10,930++  Pittsburgh, G.O., Ser. D, 6.00%, 9/01/02, AMBAC ...........................         N/A              11,419,336
                                                                                                                        ------------
                                                                                                                          57,804,906
                                                                                                                        ------------
                     TEXAS--26.8%
  AAA      13,000++  Austin Pub. Impvt., G.O., 6.10%, 9/01/02, AMBAC ...........................         N/A              13,386,360
                     Austin Util. Sys. Rev.,
  AAA      11,515      Ser. A, Zero Coupon, 11/15/08, MBIA .....................................     No Opt. Call          7,422,339
  AAA       5,000      Ser. A, Zero Coupon, 11/15/09, AMBAC ....................................     No Opt. Call          3,047,150
  AAA       5,000      Ser. A, Zero Coupon, 11/15/09, MBIA .....................................     No Opt. Call          3,047,150
  AAA       7,000      6.25%, 11/15/08, AMBAC ..................................................     11/02 @ 102           7,335,650
  AAA       5,000      6.625%, 11/15/08, AMBAC .................................................     No Opt. Call          5,524,900
                     Baytown, G.O., AMBAC,
  AAA       2,385++    6.40%, 2/01/02 ..........................................................         N/A               2,448,107
  AAA       2,840      6.40%, 2/01/08 ..........................................................      2/02 @ 100           2,904,752
  AAA       9,930    Circle C Mun. Util. Dist. No. 3 Rev., 6.50%, 11/15/09, FGIC ...............     11/01 @ 100          10,138,133
                     Coppell Indpt. Sch. Dist., MBIA,
  AAA       1,430      6.10%, 8/15/09 ..........................................................         ETM               1,531,273
  AAA       2,495      6.10%, 8/15/09 ..........................................................      8/02 @ 100           2,553,632
  AAA       4,390    Houston Indpt. Sch. Dist., Zero Coupon, 8/15/09, AMBAC ....................     No Opt. Call          2,710,957
  AAA      16,135    Houston Wtr. & Swr. Sys. Rev., Jr. Lien, Ser. C, 6.25%, 12/01/09, MBIA ....     12/02 @ 102          16,898,185
  AAA       6,000    San Antonio Elec. & Gas Rev., Ser. B, Zero Coupon, 2/01/10, FGIC ..........         ETM               3,602,820
                     Texas Mun. Pwr. Agcy. Rev.,
  AAA      15,000      Zero Coupon, 9/01/08, AMBAC .............................................     No Opt. Call          9,773,400
  AAA      16,175      Zero Coupon, 9/01/09, AMBAC .............................................     No Opt. Call          9,965,094
  AAA       7,000      5.00%, 9/01/10, FGIC ....................................................      9/04 @ 100           6,892,270
  AAA       5,900    Texas St. Pub. Fin. Auth. Bldg. Rev., Ser. B, 6.25%, 2/01/09, AMBAC .......     No Opt. Call          6,358,666
  AAA       2,275    Ysleta Indpt. Sch. Dist. Rev., Zero Coupon, 8/15/08, PSFG .................     No Opt. Call          1,485,757
                                                                                                                        ------------
                                                                                                                         117,026,595
                                                                                                                        ------------
</TABLE>

                       See Notes to Financial Statements.

                                       7
<PAGE>




<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
           PRINCIPAL                                                                                   OPTION
            AMOUNT                                                                                       CALL              VALUE
  RATING*    (000)                                 DESCRIPTION                                        PROVISIONS+         (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>      <C>         <C>                                                                            <C>                 <C>
                     UTAH--3.6%
  AAA    $  3,500    Intermountain Pwr. Agcy. Rev., Ser. B, 6.00%, 7/01/07, MBIA ...............     No Opt. Call       $  3,701,950
  AAA       1,550    Salt Lake Cnty. Mun. Bldg. Auth. Lease Rev., Ser. A, 6.05%, 10/01/08, MBIA      10/04 @ 101           1,622,540
  AAA      10,300    Utah St., G.O., Ser. F, 5.00%, 7/01/10 ....................................      7/07 @ 100          10,215,128
                                                                                                                        ------------
                                                                                                                          15,539,618
                                                                                                                        ------------
                     WASHINGTON--14.4%
  AAA      12,850    King Cnty., G.O., Ser. D, 5.55%, 12/01/08, MBIA ...........................     12/07 @ 102          13,268,782
                     Snohomish Cnty. Sch. Dist., G.O., MBIA,
  AAA       2,235++    6.10%, 12/01/03 .........................................................         N/A               2,364,585
  AAA       1,765      6.10%, 12/01/08 .........................................................     12/03 @ 102           1,848,520
                     Washington St. Hlth. Care Fac. Auth. Rev., MBIA,
  AAA       1,010      Catholic Health Initiatives A, 5.30%, 12/01/08 ..........................     No Opt. Call          1,014,121
  AAA       1,000      Catholic Health Initiatives A, 5.40%, 12/01/10 ..........................      6/10 @ 101           1,001,060
  AAA       9,000      Virginia Mason Oblig. Group, 6.30%, 2/15/09 .............................      2/03 @ 102           9,397,620
                     Washington St. Pub. Pwr. Supply Sys. Rev.,
  AAA       3,000      Nuclear Proj. No. 2, 5.55%, 7/01/10, FGIC ...............................      7/03 @ 102           3,008,160
  AAA      11,000      Nuclear Proj. No. 2, Ser. A, 5.80%, 7/01/07, FSA ........................     No Opt. Call         11,447,040
  AAA      13,635      Nuclear Proj. No. 2, Ser. A, 6.25%, 7/01/09, MBIA .......................      7/02 @ 102          14,221,578
  AAA       5,550      Nuclear Proj. No. 3, Zero Coupon, 7/01/07, BIGI .........................     No Opt. Call          3,823,228
  AAA       2,000      Nuclear Proj. No. 3, Zero Coupon, 7/01/08, BIGI .........................     No Opt. Call          1,302,320
                                                                                                                        ------------
                                                                                                                          62,697,014
                                                                                                                        ------------
                     WEST VIRGINIA--2.7%
  AAA      11,600    West Virginia St. Pkwys. Econ. Dev. & Tourism Auth., 5.70%, 5/15/09, FGIC .      5/03 @ 102          11,820,864
                                                                                                                        ------------
                     TOTAL LONG-TERM INVESTMENTS (COST $664,842,593) ...........................                         699,578,485
                                                                                                                        ------------
</TABLE>

                       See Notes to Financial Statements.

                                       8
<PAGE>




<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
           PRINCIPAL                                                                                   OPTION
            AMOUNT                                                                                       CALL              VALUE
  RATING*    (000)                                 DESCRIPTION                                        PROVISIONS+         (NOTE 1)
-----------------------------------------------------------------------------------------------------------------------------------
<S>         <C>      <C>                                                                            <C>                 <C>
                     SHORT-TERM INVESTMENTS**
                     NEW YORK
  A-1+      $  50    Long Island Pwr. Auth. New York Elec. Sys. Rev., Sub. Ser. 5,
                       4.40%, 7/03/00, FRDD ....................................................         N/A           $     50,000
                     TEXAS
  A-1+         85    Harris Cnty. Texas Hlth. Fac. Dev. Corp. Rev., St. Lukes Episcopal Hosp.,
                       Ser. A, 4.55%, 7/03/00, FRDD ............................................         N/A                 85,000
                     WASHINGTON
  A-1+         50    Washington St. Hlth. Care Fac. Auth. Rev., Sisters of Providence Ser. B,
                       4.45%, 7/03/00, FRDD ....................................................         N/A                 50,000
                                                                                                                       ------------
                     TOTAL SHORT-TERM INVESTMENTS (COST $185,000)                                                           185,000
                                                                                                                       ------------
                     TOTAL INVESTMENTS--160.4% (COST $665,027,593)                                                      699,763,485
                     Other assets in excess of liabilities--1.7%                                                          7,413,467
                     Liquidation value of preferred stock--(62.1)%                                                     (271,000,000)
                                                                                                                       ------------
                     NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100%                                                $436,176,952
                                                                                                                       ============
</TABLE>

----------

*    Using the higher of Standard & Poor's, Moody's or Fitch's rating.

**   For  purposes of  amortized  cost  valuation,  the  maturity  date of these
     instruments  is  considered to be the earlier of the next date on which the
     security  can be  redeemed  at par,  or the next  date on which the rate of
     interest is adjusted.

+    Option  call  provisions:  date  (month/year)  and  price  of the  earliest
     optional call or redemption.  There may be other call provisions at varying
     prices at later dates.

++   This bond is prerefunded. See glossary for definition.


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                              THE FOLLOWING ABBREVIATIONS ARE USED IN PORTFOLIO DESCRIPTIONS:
          <S>                                                         <C>
           AMBAC -- American Municipal Bond Assurance Corporation       FRDD -- Floating Rate Daily Demand**
            BIGI -- Bond Investors Guaranty Insurance Company            FSA -- Financial Security Assurance
          CAPMAC -- Capital Markets Assurance Company                   G.O. -- General Obligation
          C.O.P. -- Certificate of Participation                        MBIA -- Municipal Bond Insurance Association
             ETM -- Escrowed to Maturity                              P.C.R. -- Pollution Control Revenue
            FGIC -- Financial Guaranty Insurance Company                PSFG -- Permanent School Fund Guaranty
            FNMA -- Federal National Mortgage Association
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                       See Notes to Financial Statements.

                                       9
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------

ASSETS
Investments, at value (cost $665,027,593)
(Note 1) .......................................................   $699,763,485
Interest receivable ............................................     10,987,712
Receivable for investments sold ................................        195,000
Other assets ...................................................         29,906
                                                                   ------------
                                                                    710,976,103
                                                                   ------------
LIABILITIES
Dividends payable--common stock ................................      1,802,470
Due to custodian ...............................................      1,074,127
Dividends payable--preferred stock .............................        262,106
Offering costs payable--preferred stock ........................        236,383
Advisory fee payable (Note 2) ..................................        202,945
Administration fee payable (Note 2) ............................         57,984
Other accrued expenses .........................................        163,136
                                                                   ------------
                                                                      3,799,151
                                                                   ------------
NET INVESTMENT ASSETS ..........................................   $707,176,952
                                                                   ============
Net investment assets were comprised of:
  Common stock:
    Par value (Note 4) .........................................   $    272,071
    Paid-in capital in excess of par ...........................    377,481,620
  Preferred stock (Note 4) .....................................    271,000,000
                                                                   ------------
                                                                    648,753,691

  Undistributed net investment income ..........................     24,152,760
  Accumulated net realized loss ................................       (465,391)
  Net unrealized appreciation ..................................     34,735,892
                                                                   ------------
  Net investment assets, June 30, 2000 .........................   $707,176,952
                                                                   ============
  Net assets applicable to common shareholders .................   $436,176,952
                                                                   ============
  Net asset value per common share:
    ($436,176,952 / 27,207,093 shares of
    common stock issued and outstanding) .......................   $      16.03
                                                                   ============

--------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
NET INVESTMENT INCOME
Income
  Interest and discount earned .................................   $ 19,587,170
                                                                   ------------

Expenses
  Investment advisory ..........................................      1,186,163
  Administration ...............................................        338,904
  Auction agent ................................................        325,000
  Reports to shareholders ......................................        117,500
  Legal ........................................................         75,000
  Custodian ....................................................         64,500
  Directors ....................................................         36,500
  Independent accountants ......................................         29,000
  Registration .................................................         16,000
  Transfer agent ...............................................         15,000
  Miscellaneous ................................................         86,642
                                                                   ------------
      Total expenses ...........................................      2,290,209
                                                                   ------------
Net investment income ..........................................     17,296,961
                                                                   ------------

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS
Net realized loss on investments ...............................       (125,613)
Net change in unrealized appreciation
  on investments ...............................................        407,534
                                                                   ------------
Net gain on investments ........................................        281,921
                                                                   ------------

NET INCREASE IN NET INVESTMENT
  ASSETS RESULTING FROM OPERATIONS .............................   $ 17,578,882
                                                                   ============

                       See Notes to Financial Statements.

                                       10
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS (UNAUDITED)
--------------------------------------------------------------------------------

                                                SIX MONTHS ENDED    YEAR ENDED
                                                    JUNE 30,       DECEMBER 31,
                                                      2000             1999
                                                -------------    -------------
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
OPERATIONS:
  Net investment income ......................   $  17,296,961    $  33,039,797
  Net realized loss on investments ...........        (125,613)         (33,995)
  Net change in unrealized appreciation
    on investments ...........................         407,534      (33,645,451)
                                                 -------------    -------------

         Net increase (decrease) in net
           investment assets resulting
           from operations ...................      17,578,882         (639,649)
                                                 -------------    -------------
DIVIDENDS:
  To common shareholders from net
    investment income ........................     (10,814,582)     (21,629,233)
  To preferred shareholders from net
    investment income ........................      (4,934,600)      (6,652,978)
                                                 -------------    -------------
         Total dividends .....................     (15,749,182)     (28,282,211)
                                                 -------------    -------------
CAPITAL STOCK TRANSACTIONS:
  Net proceeds from additional issuance
    of preferred shares ......................      64,032,840               --
                                                 -------------    -------------
      Total increase (decrease) ..............      65,862,540      (28,921,860)
                                                 -------------    -------------

NET INVESTMENT ASSETS
Beginning of period ..........................     641,314,412      670,236,272
                                                 -------------    -------------
End of period (including undistributed
  net investment income of $24,152,760 and
  $22,604,981, respectively) .................   $ 707,176,952    $ 641,314,412
                                                 =============    =============

                       See Notes to Financial Statements.

                                       11
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                        SIX MONTHS ENDED                  YEAR ENDED DECEMBER 31,
                                                            JUNE 30,      --------------------------------------------------------
PER COMMON SHARE OPERATING PERFORMANCE:                      2000           1999        1998        1997        1996        1995
                                                           --------       --------    --------    --------    --------    --------
<S>                                                        <C>            <C>         <C>         <C>         <C>         <C>
Net asset value, beginning of the period ................  $  16.00       $  17.06    $  16.80    $  15.90    $  16.08    $  13.88
                                                           --------       --------    --------    --------    --------    --------
Net investment income ...................................       .64           1.21        1.20        1.18        1.17        1.19
Net realized and unrealized gain (loss)
  on investments ........................................       .01          (1.23)        .11         .78        (.27)       2.21
                                                           --------       --------    --------    --------    --------    --------
Net increase (decrease) from investment operations ......       .65           (.02)       1.31        1.96         .90        3.40
                                                           --------       --------    --------    --------    --------    --------
Dividends and distributions:
  Dividends from net investment income to:
    Common shareholders .................................      (.40)          (.80)       (.80)       (.79)       (.79)       (.83)
    Preferred shareholders ..............................      (.18)          (.24)       (.25)       (.27)       (.25)       (.28)
  Distributions from net realized gain
    on investments to:
    Common shareholders .................................        --             --          --          --        (.03)       (.06)
    Preferred shareholders ..............................        --             --          --          --        (.01)       (.02)
  Distributions in excess of net realized
    gain on investments to:
    Common shareholders .................................        --             --          **          **          **        (.01)
    Preferred shareholders ..............................        --             --          **          **          **          **
                                                           --------       --------    --------    --------    --------    --------
Total dividends and distributions .......................      (.58)         (1.04)      (1.05)      (1.06)      (1.08)      (1.20)
                                                           --------       --------    --------    --------    --------    --------
Capital charge with respect to issuance
    of preferred shares .................................      (.04)            --          --          --          --          --
                                                           --------       --------    --------    --------    --------    --------
Net asset value, end of period* .........................  $  16.03       $  16.00    $  17.06    $  16.80    $  15.90    $  16.08
                                                           ========       ========    ========    ========    ========    ========
Market value, end of period* ............................  $  14.13       $  13.75    $  16.13    $  15.25    $  14.50    $  13.50
                                                           ========       ========    ========    ========    ========    ========
TOTAL INVESTMENT RETURN+ ................................      5.71%        (10.14)%     11.21%      10.97%      13.56%      17.64%
                                                           ========       ========    ========    ========    ========    ========

RATIOS TO AVERAGE NET ASSETS OF COMMON
  SHAREHOLDERS:
Expenses++ ..............................................      1.06%+++        .93%        .88%        .92%        .95%        .95%
Net investment income before preferred
  stock dividends++ .....................................      8.06%+++       7.30%       7.10%       7.19%       7.32%       7.74%
Preferred stock dividends ...............................      2.30%+++       1.47%       1.49%       1.03%       1.64%       1.97%
Net investment income available to
  common shareholders ...................................      5.76%+++       5.83%       5.61%       5.56%       5.68%       5.77%

SUPPLEMENTAL DATA:
Average net assets of common shareholders
  (in thousands) ........................................  $431,808       $452,317    $458,993    $444,895    $434,692    $417,017
Portfolio turnover ......................................         2%             1%          0%         11%          8%         27%
Net assets of common shareholders, end of period
  (in thousands) ........................................  $436,177       $435,314    $464,236    $457,192    $432,609    $437,470
Preferred stock outstanding (in thousands) ..............  $271,000       $206,000    $206,000    $206,000    $206,000    $206,000
Asset coverage per share of preferred stock,
  end of period .........................................  $ 65,262       $ 77,857    $ 81,361    $ 80,508    $ 77,525    $ 78,112
</TABLE>


----------

*    Net asset value and market value are  published in BARRON'S on Saturday and
     THE WALL STREET JOURNAL on Monday.

**   Actual amount paid to common  shareholders  was $0.005235 , $0.004814,  and
     $0.00271  for  the  years  ended   December  31,  1998,   1997,  and  1996,
     respectively.  Actual amount paid to preferred  shareholders was $0.001696,
     $0.00154,  $0.00084  and  $0.002929  per common  share for the years  ended
     December 31, 1998, 1997, 1996 and 1995, respectively.

+    Total investment  return is calculated  assuming a purchase of common stock
     at the  current  market  price on the first  day and a sale at the  current
     market  price  on the  last  day  of the  period  reported.  Dividends  and
     distributions are assumed for purposes of this calculation to be reinvested
     at prices  obtained under the Trust's  dividend  reinvestment  plan.  Total
     investment return does not reflect brokerage commissions.  Total investment
     returns for periods less than one full year are not annualized.

++   Ratios are  calculated  on the basis of income and expenses  applicable  to
     both the common and preferred stock,  relative to the average net assets of
     common stockholders.

+++  Annualized

The information above represents the unaudited operating  performance data for a
share of common stock outstanding,  total investment  return,  ratios to average
net  assets  and  other  supplemental  data  for  the  periods  indicated.  This
information has been determined based upon financial information provided in the
financial statements and market value data for Trust's common shares.

                       See Notes to Financial Statements.

                                       12
<PAGE>


--------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
NOTES TO FINANCIAL STATEMENTS
(UNAUDITED)
--------------------------------------------------------------------------------

NOTE 1. ORGANIZATION & ACCOUNTING POLICIES

The BlackRock  Insured  Municipal 2008 Term Trust Inc. (the "Trust"),  was orga-
nized in  Maryland  on August 7, 1992 as a  diversified,  closed-end  management
investment company.  The Trust's investment objective is to manage a diversified
portfolio of high quality securities that will return $15 per share to investors
on or about December 31, 2008 while providing current income exempt from regular
federal income tax. The ability of issuers of debt  securities held by the Trust
to meet their  obligations  may be  affected  by  economic  developments  in the
specific  industry  or  region.  No  assurance  can be given  that  the  Trust's
investment objective will be achieved.

     The following is a summary of significant  accounting  policies followed by
the Trust:

SECURITIES VALUATION:  Municipal securities  (including  commitments to purchase
such  securities  on a  "when-issued"  basis)  are valued on the basis of prices
provided  by  dealers or  pricing  services  approved  by the  Trust's  Board of
Directors.  In determining the value of a particular security,  pricing services
may use certain  information  with respect to transactions  in such  securities,
quotations from bond dealers,  market transactions in comparable  securities and
various  relationships  between  securities in  determining  values.  Short-term
securities  are valued at amortized  cost.  Any  securities  or other assets for
which such current  market  quotations  are not readily  available are valued at
fair value as determined in good faith under procedures established by and under
the general supervision and responsibility of the Trust's Board of Directors.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME:  Securities  transactions  are
recorded  on the trade  date.  Realized  and  unrealized  gains and  losses  are
calculated  on the  identified  cost basis.  Interest  income is recorded on the
accrual  basis and the Trust  amortizes  premium  and  accretes  original  issue
discount on  securities  purchased  using the interest  method.

FEDERAL  INCOME  TAXES:  It is the  Trust's  intention  to  continue to meet the
requirements  of the Internal  Revenue Code  applicable to regulated  investment
companies  and to distribute  sufficient  net income to  shareholders.  For this
reason and because  substantially  all of the Trust's  gross income  consists of
tax-exempt interest, no Federal income tax provision is required.

DIVIDENDS  AND  DISTRIBUTIONS:   The  Trust  declares  and  pays  dividends  and
distributions to common  shareholders  monthly from net investment  income,  net
realized short-term capital gains and other sources, if necessary. Net long-term
capital  gains,  if any,  in excess  of loss  carryforwards  may be  distributed
annually.  Dividends and  distributions  are recorded on the  ex-dividend  date.
Dividends and distributions to preferred shareholders are accrued and determined
as described in Note 4.

ESTIMATES: The preparation of financial statements in conformity with accounting
principles   generally  accepted  in  the  United  States  of  America  requires
management to make estimates and assumptions that affect the reported amounts of
assets and  liabilities  and disclosure of contingent  assets and liabilities at
the date of the financial  statements  and the reported  amounts of revenues and
expenses  during the reporting  period.  Actual  results could differ from those
estimates.

DEFERRED  COMPENSATION PLAN: Under a deferred  compensation plan approved by the
Board of Directors on February 24, 2000,  non-interested  Directors may elect to
defer receipt of all or a portion of their annual compensation.

     Deferred amounts earn a return as though equivalent dollar amounts had been
invested in common shares of other  BlackRock  funds  selected by the Directors.
This has the same economic  effect as if the Directors had invested the deferred
amounts in such other BlackRock funds.

     The deferred  compensation  plan is not funded and  obligations  thereunder
represent  general unsecured claims against the general assets of the Trust. The
Trust may, however,  elect to invest in common shares of those funds selected by
the Directors in order to match its deferred compensation obligations.

NOTE 2. AGREEMENTS

The Trust has an Investment  Advisory Agreement with BlackRock  Advisors,  Inc.,
(the "Advisor"), which is a wholly-owned subsidiary of BlackRock, Inc., which in
turn is an indirect  majority-owned  subsidiary of PNC Financial Services Group,
Inc. The Trust has an  Administration  Agreement with Princeton  Administrators,
L.P. (the "Administrator"),  an indirect wholly-owned affiliate of Merrill Lynch
& Co., Inc.

     The  investment  advisory  fee paid to the Advisor is  computed  weekly and
payable  monthly at an annual  rate of 0.35% of the Trust's  average  weekly net
investment  assets.  The  administration  fee paid to the  Administrator is also
computed  weekly and  payable  monthly at an annual rate of 0.10% of the Trust's
average weekly net investment assets.

     Pursuant to the agreements,  the Advisor provides continuous supervision of
the investment  portfolio and pays the compensation of officers of the Trust who
are  affiliated  persons of the Advisor.  The  Administrator  pays occupancy and
certain  clerical and accounting  costs of the Trust.  The Trust bears all other
costs and expenses.

                                       13
<PAGE>


NOTE 3. PORTFOLIO SECURITIES

Purchases and sales of investments,  other than short-term investments,  for the
six  months  ended  June  30,  2000,  aggregated  $77,626,133  and  $12,451,089,
respectively.

     The federal  income tax basis of the Trust's  investments at June 30, 2000,
was $665,333,376,  and accordingly,  net unrealized appreciation was $34,430,109
(gross      unrealized      appreciation--$34,487,649,      gross     unrealized
depreciation--$57,540).

     For federal income tax purposes,  the Trust had a capital loss carryforward
at  December  31,  1999 of  approximately  $34,000  which  will  expire in 2007.
Accordingly, no capital gain distribution is expected to be paid to shareholders
until net gains have been realized in excess of such amounts.

NOTE 4. CAPITAL

There are 200 million  shares of $.01 par value  common  stock  authorized.  The
Trust may classify or reclassify any unissued shares of common stock into one or
more series of preferred stock. Of the 27,207,093  common shares  outstanding at
June 30, 2000, the Advisor owned 7,093 shares.  As of June 30, 2000,  there were
10,840  preferred  shares  outstanding  as follows:  Series  T28--2,060,  Series
R28--2,060,  Series T7--4,660, and Series R7--2,060, which includes 2,600 shares
of Series T7 issued on March 10, 2000.

     On March 10, 2000, the Trust  reclassified 2,600 shares of common stock and
issued an additional 2,600 shares of Series T7 preferred shares.  The additional
shares  issued have  identical  rights and  features of the  existing  Series T7
preferred shares. Estimated offering costs of $317,160 and underwriting discount
of $650,000 have been charged to paid-in capital in excess of the common shares.

     Dividends on Series T7 and R7 are cumulative at a rate which is reset every
7 days  based  on the  results  of an  auction.  Dividends  on  Series  T28  are
cumulative  at a rate which is reset  every 28 days  based on the  results of an
auction.  Series R28 paid dividends monthly at a rate established at the initial
offer- ing through May 17, 1994. Thereafter,  rates on Series R28 reset every 28
days based on results of an auction.  Dividend  rates ranged from 2.40% to 5.90%
during the period ended June 30, 2000.

     The Trust may not declare  dividends or make other  distributions on shares
of common stock or purchase any such shares if, at the time of the  declaration,
distribution  or  purchase,  asset  coverage  with  respect  to the  outstanding
Preferred Stock would be less than 200%.

     The Preferred  Stock is redeemable at the option of the Trust,  in whole or
in part, on any dividend  payment date at $25,000 per share plus any accumulated
or unpaid dividends whether or not declared. The Preferred Stock is also subject
to  mandatory  redemption  at $25,000 per share plus any  accumulated  or unpaid
dividends,  whether or not  declared  if certain  requirements  relating  to the
composition  of the  assets  and  liabilities  of the  Trust as set forth in the
Articles of Incorporation are not satisfied.

     The holders of Preferred  Stock have voting  rights equal to the holders of
common stock (one vote per share) and will vote  together with holders of shares
of common stock as a single class. However,  holders of Preferred Stock are also
entitled to elect two of the Trust's  directors.  In  addition,  the  Investment
Company Act of 1940 requires that along with approval by stockholders that might
otherwise  be  required,  the  approval  of the  holders  of a  majority  of any
outstanding  preferred stock,  voting separately as a class would be required to
(a) adopt any plan of  reorganization  that would adversely affect the Preferred
Stock, and (b) take any action requiring a vote of security holders,  including,
among other  things,  changes in the Trust's  subclassification  as a closed-end
investment company or changes in its fundamental investment restrictions.

NOTE 5. DIVIDENDS

     On June 30, 2000,  the Board of Directors of the Trust  declared a dividend
from undistributed earnings of $0.06625 per common share payable, August 1, 2000
to shareholders of record on July 14, 2000.

     For  the  period  July 1,  2000 to July  31,  2000  dividends  declared  on
Preferred  Shares  totalled  $959,405  in  aggregate  for the  four  outstanding
Preferred Share series.

                                       14
<PAGE>


--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                           DIVIDEND REINVESTMENT PLAN
--------------------------------------------------------------------------------

     Pursuant  to  the  Trust's   Dividend   Reinvestment   Plan  (the  "Plan"),
shareholders may elect to have all  distributions of dividends and capital gains
reinvested  by State Street Bank and Trust  Company (the "Plan  Agent") in Trust
shares  pursuant to the Plan.  Shareholders  who do not  participate in the Plan
will receive all  distributions  in cash paid by check in United States  dollars
mailed  directly  to the  shareholders  of record  (or if the shares are held in
street or other nominee  name,  then to the nominee) by the transfer  agent,  as
dividend disbursing agent.

     The Plan Agent serves as agent for the  shareholders in  administering  the
Plan.  After the Trust  declares a dividend or determines to make a capital gain
distribution,  the Plan Agent will, as agent for the  participants,  receive the
cash  payment and use it to buy Trust  shares in the open market on the New York
Stock Exchange or elsewhere for the participants'  accounts.  The Trust will not
issue any new shares under the Plan.

     Participants  in the Plan may withdraw from the Plan upon written notice to
the Plan Agent and will receive  certificates  for whole Trust shares and a cash
payment for any fraction of a Trust share.

     The Plan Agent's fees for the handling of the reinvestment of dividends and
distributions  will be paid by the Trust.  However,  each participant will pay a
pro rata  share of  brokerage  commissions  incurred  with  respect  to the Plan
Agent's open market  purchases in connection with the  reinvestment of dividends
and  distributions.  The automatic  reinvestment of dividends and  distributions
will not relieve  participants  of any federal income tax that may be payable on
such dividends or distributions.

     The Trust  reserves the right to amend or terminate  the Plan as applied to
any dividend or  distribution  paid  subsequent to written  notice of the change
sent to all  shareholders  of the Trust at least 90 days  before the record date
for the dividend or distribution.  The Plan also may be amended or terminated by
the Plan Agent upon at least 90 days' written notice to all  shareholders of the
Trust.  All  correspondence  concerning  the Plan should be directed to the Plan
Agent at (800) 699-1BFM. The address is on the front of this report.

                                       15
<PAGE>


--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                             ADDITIONAL INFORMATION
--------------------------------------------------------------------------------

     ANNUAL MEETING OF TRUST  SHAREHOLDERS.  There have been no material changes
in the Trust's Investment  objectives or policies that have not been approved by
the  shareholders  or to its charter or by-laws or in the principal risk factors
associated  with  investment  in the  Trust.  There  have been no changes in the
persons who are  primarily  responsible  for the  day-to-day  management  of the
Trust's Portfolio.

     The Annual Meeting of Trust  Shareholders  was held May 18, 2000 to vote on
the following matters:

     (1)  To elect two Directors as follows:

          DIRECTORS                                CLASS       TERM     EXPIRING
          ---------                                -----       ----     --------
          Richard E. Cavanagh ................       I       3 years      2003
          James Clayburn La Force Jr. ........       I       3 years      2003

          Directors  whose term of office  continues  beyond  this  meeting  are
          Andrew F. Brimmer,  Kent Dixon,  Frank J.  Fabozzi,  Laurence D. Fink,
          Walter F. Mondale and Ralph L. Schlosstein.

     (2)  To ratify the selection of Deloitte & Touche LLP as independent public
          accountants of the Trust for the fiscal year ending December 31, 2000.

     Shareholders  elected the two  Directors  and  ratified  the  selection  of
     Deloitte & Touche LLP. The results of the voting was as follows:

                                      VOTES FOR*   VOTES AGAINST*  ABSTENTIONS*

     Richard E. Cavanagh............       8,125           --            55
     James Clayburn La Force Jr.....  19,015,860           --       315,066
     Ratification of
       Deloitte & Touche LLP .......  19,059,314       84,910       186,702

----------

*    The votes represent  common and preferred  shareholders  voting as a single
     class except for the election of Richard E. Cavanagh who was elected by the
     preferred shareholders.

                                       16
<PAGE>


--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                               INVESTMENT SUMMARY
--------------------------------------------------------------------------------


THE TRUST'S INVESTMENT OBJECTIVE:

The BlackRock  Insured  Municipal2008  Term Trust's  investment  objective is to
provide  current income exempt from regular federal income tax and to return $15
per share (the initial public offering price per share) to investors on or about
December 31, 2008.

WHO MANAGES THE TRUST?

BlackRock  Advisors,  Inc.  (the  "Advisor")  is  an  SEC-registered  investment
advisor.  As of  June  30,  2000,  the  Advisor  and its  affiliates  (together,
"BlackRock")  managed $177 billion on behalf of taxable and  tax-exempt  clients
worldwide.  Strategies include fixed income, equity and cash and may incorporate
both domestic and  international  securities.  Domestic fixed income  strategies
utilize  the  government,   mortgage,  corporate  and  municipal  bond  sectors.
BlackRock manages twenty-two  closed-end funds that are traded on either the New
York or American stock  exchanges,  and a $28 billion family of open-end  funds.
BlackRock  manages  over  629  accounts,  domiciled  in the  United  States  and
overseas.

WHAT CAN THE TRUST INVEST IN?

The Trust  intends to invest at least 80% of its total  assets in a  diversified
portfolio  of  municipal  obligations  insured as to the timely  payment of both
principal  and  interest.  The Trust may invest up to 20% of its total assets in
uninsured municipal obligations which are rated Aaa by Moody's or AAA by S&P, or
are  determined  by the  Trust's  Advisor  to be of  comparable  credit  quality
(guaranteed, escrowed or backed in trust).

WHAT IS THE ADVISOR'S INVESTMENT STRATEGY?

The Advisor will seek to meet the Trust's  investment  objective by managing the
assets of the Trust so as to return the initial  offering  price ($15 per share)
at maturity.  The Advisor will implement a conservative  strategy that will seek
to closely  match the  maturity of the assets of the  portfolio  with the future
return of the initial investment at the end of 2008. At the Trust's termination,
BlackRock expects that the value of the securities which have matured,  combined
with the value of the  securities  that are sold,  if any, will be sufficient to
return the initial offering price to investors. On a continuous basis, the Trust
will  seek its  objective  by  actively  managing  its  portfolio  of  municipal
obligations and retaining a small portion of its income each year.

In addition to seeking the return of the  initial  offering  price,  the Advisor
also seeks to provide  current income exempt from regular  federal income tax to
investors.  The  portfolio  managers  will attempt to achieve this  objective by
investing in securities that provide competitive  income. In addition,  leverage
will be used to  enhance  the  income  of the  portfolio.  In order to  maintain
competitive  yields as the Trust  approaches  maturity  and  depending on market
conditions, the Advisor will attempt to purchase securities with call protection
or maturities as close to the Trust's maturity date as possible. Securities with
call  protection  should  provide the  portfolio  with some degree of protection
against reinvestment risk during times of lower prevailing interest rates. Since
the Trust's  primary goal is to return the initial  offering  price at maturity,
any cash that the Trust  receives  prior to its maturity date will be reinvested
in securities  with  maturities  which  coincide with the remaining  term of the
Trust.  It is important to note that the Trust will be managed so as to preserve
the integrity of the return of the initial offering price. If market conditions,
such as interest rate  volatility,  force a choice  between  current  income and
risking the return of the initial offering price, it is likely the return of the
initial offering price will be emphasized.

HOW ARE THE TRUST'S  SHARES  PURCHASED  AND SOLD?  DOES THE TRUST PAY  DIVIDENDS
REGULARLY?

The  Trust's  shares are traded on the New York Stock  Exchange  which  provides
investors with  liquidity on a daily basis.  Orders to buy or sell shares of the
Trust must be placed through a registered broker or financial advisor. The Trust
pays monthly dividends which are typically paid on the first business day of the
month. For shares held in the shareholder's name, dividends may be reinvested in
additional shares of the Trust through the Trust's transfer agent,  State Street
Bank and Trust Company. Investors who wish to hold shares in a brokerage account
should check with their financial  advisor to determine  whether their brokerage
firm offers dividend reinvestment services.

                                       17
<PAGE>


LEVERAGE CONSIDERATIONS IN A TERM TRUST

Under current  market  conditions,  leverage  increases the income earned by the
Trust.  The Trust employs leverage  primarily  through the issuance of preferred
stock.  Leverage  permits  the Trust to  borrow  money at  short-term  rates and
reinvest that money in longer-term  assets which typically offer higher interest
rates.  The  difference  between the cost of the  borrowed  funds and the income
earned on the proceeds that are invested in longer term assets is the benefit to
the Trust from leverage.

Leverage also increases the duration (or price  volatility of the net assets) of
the Trust,  which can improve the  performance  of the Trust in a declining rate
environment,  but can cause net  assets to decline  faster  than the market in a
rapidly rising rate environment.  The Advisor's portfolio managers  continuously
monitor and  regularly  review the  Trust's  use of  leverage  and the Trust may
reduce,  or unwind,  the amount of leverage employed should the Advisor consider
that reduction to be in the best interests of the shareholders.

SPECIAL CONSIDERATIONS AND RISK FACTORS RELEVANT TO TERM TRUSTS

THE TRUST IS  INTENDED  TO BE A  LONG-TERM  INVESTMENT  AND IS NOT A  SHORT-TERM
TRADING VEHICLE.

RETURN OF INITIAL  INVESTMENT.  Although the objective of the Trust is to return
its initial offering price upon termination, there can be no assurance that this
objective will be achieved.

DIVIDEND CONSIDERATION. The income and dividends paid by the Trust are likely to
decline  to some  extent  over  the  term of the  Trust  due to the  anticipated
shortening of the dollar-weighted average maturity of the Trust's assets.

LEVERAGE.  The Trust utilizes  leverage through the issuance of preferred stock,
which involves  special risks.  The Trust's net asset value and market value may
be more volatile due to its use of leverage.

MARKET PRICE OF SHARES.  The shares of closed-end  investment  companies such as
the Trust trade on the New York Stock  Exchange  (NYSE symbol:  BRM) and as such
are subject to supply and demand influences.  As a result, shares may trade at a
discount or a premium to their net asset value.

ILLIQUID  SECURITIES.  The Trust may  invest in  securities  that are  illiquid,
although  under current  market  conditions the Trust expects only to do so to a
limited extent. An investment in these securities involves special risks.

ANTITAKEOVER  PROVISIONS.  Certain antitakeover provisions will make a change in
the Trust's  business or management  more difficult  without the approval of the
Trust's Board of Directors and may have the effect of depriving  shareholders of
an  opportunity  to sell their shares at a premium above the  prevailing  market
price.

MUNICIPAL OBLIGATIONS.  Municipal obligations include debt obligations issued by
states,  cities, and local authorities,  and possessions and certain territories
of the United States to obtain funds for various public purposes,  including the
construction of public  facilities,  the refinancing of outstanding  obligations
and the obtaining of funds for general operating expenses and for loans to other
public  institutions  and  facilities.  The value of municipal  debt  securities
generally  varies  inversely with changes in prevailing  market  interest rates.
Depending  on the amount of call  protection  that the  securities  in the Trust
have, the Trust may be subject to certain  reinvestment risks in environments of
declining interest rates.

ALTERNATIVE  MINIMUM TAX (AMT).  The Trust may invest in  securities  subject to
AMT. The Trust currently holds no securities that are subject to AMT.

                                       18
<PAGE>


--------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                                    GLOSSARY
--------------------------------------------------------------------------------

CLOSED-END FUND:         Investment  vehicle  which  initially  offers  a  fixed
                         number of shares  and trades on a stock  exchange.  The
                         fund invests in a portfolio of securities in accordance
                         with its stated investment objectives and policies.

DISCOUNT:                When a fund's net asset value is greater than its stock
                         price the fund is said to be trading at a discount.

DIVIDEND:                Income  generated  by  securities  in a  portfolio  and
                         distributed  to  shareholders  after the  deduction  of
                         expenses.  This Trust  declares  and pays  dividends to
                         common shareholders on a monthly basis.

DIVIDEND REINVESTMENT:   Shareholders  may have all dividends and  distributions
                         of  capital   gains   automatically   reinvested   into
                         additional shares of a fund.

MARKET PRICE:            Price per share of a security  trading in the secondary
                         market.  For a  closed-end  fund,  this is the price at
                         which  one  share  of the  fund  trades  on  the  stock
                         exchange.  If you were to buy or sell shares, you would
                         pay or receive the market price.

NET ASSET VALUE (NAV):   Net  asset  value  is the  total  market  value  of all
                         securities  and other  assets  held by the Trust,  plus
                         income   accrued   on  its   investments,   minus   any
                         liabilities including accrued expenses,  divided by the
                         total  number  of   outstanding   shares.   It  is  the
                         underlying  value of a single share on a given day. Net
                         asset  value for the  Trust is  calculated  weekly  and
                         published  in BARRON'S on Saturday  and THE WALL STREET
                         JOURNAL on Monday.

PREMIUM:                 When a fund's stock price is greater than its net asset
                         value, the fund is said to be trading at a premium.

PRE-REFUNDED BONDS:      These securities are collateralized by U.S.  Government
                         securities which are held in escrow and are used to pay
                         principal  and  interest  on the tax  exempt  issue and
                         retire  the  bond  in  full  at  the  date   indicated,
                         typically at a premium to par.

                                       19
<PAGE>

BLACKROCK

DIRECTORS
Laurence D. Fink, CHAIRMAN
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Clayburn La Force, Jr.
Walter F. Mondale
Ralph L. Schlosstein

OFFICERS
Ralph L. Schlosstein, PRESIDENT
Keith T. Anderson, VICE PRESIDENT
Michael C. Huebsch, VICE PRESIDENT
Robert S. Kapito, VICE PRESIDENT
Kevin M. Klingert, VICE PRESIDENT
Richard M. Shea, VICE PRESIDENT/TAX
Henry Gabbay, TREASURER
James Kong, ASSISTANT TREASURER
Karen H. Sabath, SECRETARY

INVESTMENT ADVISOR
BlackRock Advisors, Inc.
400 Bellevue Parkway
Wilmington, DE 19809
(800) 227-7BFM

ADMINISTRATOR
Princeton Adminstrators, L.P.
P.O. Box 9095
Princeton, NJ 08543-9095
(800) 543-6217

CUSTODIAN AND TRANSFER AGENT
State Street Bank and Trust Company
One Heritage Drive
North  Quincy,  MA 02171
(800)  699-1BFM

AUCTION  AGENT
Deutsche Bank 4 Albany
Street New York, NY 10006

INDEPENDENT AUDITORS
Deloitte & Touche LLP
Two World Financial Center
New York, NY 10281-1434

LEGAL COUNSEL
Skadden, Arps, Slate, Meagher & Flom LLP
Four Times Square
New York, NY 10036

LEGAL COUNSEL -- INDEPENDENT DIRECTORS
Debevoise & Plimpton
875 Third Avenue
New York, NY 10022

     The accompanying  financial statements as of June 30, 2000 were not audited
and accordingly, no opinion is expressed on them.

     This  report  is for  shareholder  information.This  is not a pros-  pectus
intended for use in the purchase or sale of any securities.

                              THE BLACKROCK INSURED
                         MUNICIPAL 2008 TERM TRUST INC.
                       c/o Princeton Administrators, L.P.
                                  P.O. Box 9095
                            Princeton, NJ 08543-9095
                                 (800) 543-6217


[RECYCLE LOGO] Printed on recycled paper

THE BLACKROCK
INSURED MUNICIPAL
2008 TERM
TRUST INC.
--------------------------
SEMI-ANNUAL REPORT
JUNE 30, 2000

                                                                     09247K-10-9
                                                                     09247K-30-7
                                                                     09247K-20-8
                                                                     09247K-40-6
                                                                     09247K-50-5



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