BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC
N-30D, 1999-08-25
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- --------------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
                       SEMI-ANNUAL REPORT TO SHAREHOLDERS
                          REPORT OF INVESTMENT ADVISER
- --------------------------------------------------------------------------------

                                                                   July 31, 1999
Dear Shareholder:

      Since the  Trust's  last  report,  interest  rates  rose  sharply  as U.S.
economic  growth  remained  strong,  labor markets  tightened and  international
markets  began to recover.  In light of these  factors,  the  Federal  Reserve's
Federal Open Market Committee  increased  short-term  interest rates by 25 basis
points in June, citing a concern that inflation might start to accelerate.

    In tandem  with the Fed's  recent  rate  tightening,  BlackRock  has taken a
defensive interest rate stance. With the Treasury curve currently pricing in the
possibility  of another Fed  tightening  by year-end,  we believe that  interest
rates will trade in a relatively  narrow range until the economy  shows signs of
slowing.

    This report  contains  comments  from your Trust's  managers  regarding  the
markets  and  portfolio  in  addition  to  the  Trust's  semi-annual   financial
statements  and a detailed  portfolio  listing.  We thank you for your continued
investment in the Trust.

Sincerely,

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


                                       1

<PAGE>


                                                                   July 31, 1999

Dear Shareholder:

      We are pleased to present the semi-annual report for The BlackRock Insured
Municipal  2008 Term Trust Inc.  ("the Trust") for the six months ended June 30,
1999. 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 net
asset value over the past six months:



                        -----------------------------------------------------
                        6/30/99   12/31/98     CHANGE       HIGH       LOW
- -----------------------------------------------------------------------------
STOCK PRICE             $15.375   $16.125     (4.65%)      $16.00    $15.0625
- -----------------------------------------------------------------------------
NET ASSET VALUE (NAV)   $16.36    $17.06      (4.10%)      $17.27    $16.33
- -----------------------------------------------------------------------------

THE FIXED INCOME MARKETS
      The past six months have witnessed  continued  rapid expansion of the U.S.
economy.  GDP growth for the second  quarter of 1999 is  estimated  at an annual
rate of 3.5%-4%,  far exceeding  the  historical  non-inflationary  level of 2%.
While  BlackRock  believes that growth may slow down in the second half of 1999,
we anticipate  GDP to remain above 3% for the year. In spite of strong  domestic
economic growth,  inflationary  forces continue to remain contained;  still, the
Federal  Reserve chose to raise its target for the federal funds rate from 4.75%
to 5.00% at its June meeting. The Fed cited an easing of financial strain, tight
labor markets and a firming of foreign economies in the release accompanying the
move. The Fed dropped its tightening bias to a neutral bias, which should reduce
the  likelihood  of  another  hike  at the  August  24th  meeting.  However,  an
additional  25-50 basis points of  tightening  by year end is  possible,  as the
combination  of a very strong  domestic  economy and an  improving  situation in
Europe and Japan may allow for tighter monetary policy.

      U.S. Treasury securities  dramatically reversed their fourth quarter gains
in the  first  half of 1999.  The  yield of the  10-Year  Treasury  posted a net
decline of 118 basis points (1.18%), beginning 1999 at 4.65% and closing on June
30, 1999 at 5.78%.  Strong  economic  numbers led the Federal Reserve to adopt a
tightening bias on May 18, 1999 and ultimately raised interest rates by 25 basis
points  on June 30,  1999.  The  Federal  Reserve  eased  rates by 0.75% in 1998
because of the  global  financial  crisis  but cited in their June 1999  meeting
"Since  then much of the  financial  strain has eased,  foreign  economies  have
firmed and economic  activity in the U.S. has moved forward at a brisk pace." We
anticipate Treasuries will trade in a relatively narrow range for the balance of
1999 unless the Fed takes further action.


                                       2

<PAGE>


     Municipal bonds  outperformed  the taxable  domestic bond market during the
past six months,  returning  -0.90% (as measured by the Lehman  Municipal Index)
versus the Lehman Aggregate  Index's -1.37% on a pre-tax basis.  Municipal bonds
continue to appear attractive  relative to Treasuries on a long-term  historical
basis,  and we believe  that reduced  Treasury  supply and  increased  crossover
activity  should keep ratios at higher  than  normal  levels.  Supply and demand
technicals  continue to improve in the  municipal  market as supply has declined
23% in the first half of 1999 from last year.  Much of the drop in issuance  can
be attributed to the plunge in refunding supply, which is down nearly 50% versus
last year.  Retail investors have been adding  municipals to their portfolios at
an aggressive  pace,  which should result in the second  consecutive year of net
positive  cash flows into mutual  funds after having  negative  flows during the
previous four years. Due to the factors  mentioned above, we believe  municipals
remain a compelling investment opportunity going forward.

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,
credits  and  coupons.  Additionally,  the  Trust  emphasizes  securities  whose
maturity dates match the termination date of the Trust.  Trading activity in the
Trust  remained  low during the period,  as the market  prices of a  significant
portion of the  portfolio's  bonds are currently  above the prices at which they
were bought. A bond sold at a gain would result in the Trust realizing a capital
gain, which may require a taxable distribution. Since one of the Trust's primary
investment  objectives  is  to  pay  out  tax-exempt  income,  we  believe  that
restructuring  the portfolio in a higher interest rate  environment  remains the
most prudent strategy.

     Additionally, 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.  At the
end of the  semi-annual  period,  the Trust's  leverage  amount was 31% of total
assets.  During the past six months,  the Trust's  borrowing costs have remained
favorable.

     The  following  chart  compares  the Trust's  current and December 31, 1998
asset composition:

     ---------------------------------------------------------------------------
              THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
     ---------------------------------------------------------------------------
     SECTOR                                     JUNE 30, 1999  DECEMBER 31, 1998
     ---------------------------------------------------------------------------
     Utility/Power                                   23%              22%
     ---------------------------------------------------------------------------
     County, City & State                            21%              26%
     ---------------------------------------------------------------------------
     Hospital                                        14%              14%
     ---------------------------------------------------------------------------
     Education                                       11%               6%
     ---------------------------------------------------------------------------
     Lease Revenue                                    6%               6%
     ---------------------------------------------------------------------------
     Tax Revenue                                      6%               6%
     ---------------------------------------------------------------------------
     Transportation                                   6%               6%
     ---------------------------------------------------------------------------
     Water & Sewer                                    6%               6%
     ---------------------------------------------------------------------------
     Special District                                 3%               4%
     ---------------------------------------------------------------------------
     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/Michael P. Lustig
- -------------------                         --------------------
Robert S. Kapito                            Michael P. Lustig
Vice Chairman and Portfolio Manager         Director and Portfolio Manager
BlackRock Financial Management, Inc.        BlackRock Financial Management, 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 6/30/99:                               $15.375
   -----------------------------------------------------------------------------
   Net Asset Value as of 6/30/99:                                   $16.36
   -----------------------------------------------------------------------------
   Yield on Closing Stock Price as of 6/30/99 ($15.375)1:             5.17%
   -----------------------------------------------------------------------------
   Current Monthly Distribution per Common Share2:                   $0.06625
   -----------------------------------------------------------------------------
   Current Annualized Distribution per Common Share2:                $0.795
   -----------------------------------------------------------------------------

- -----------------
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>
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
PORTFOLIO OF INVESTMENTS JUNE 30, 1999 (Unaudited)
- --------------------------------------------------------------------------------------------------------
            PRINCIPAL                                                      OPTION
             AMOUNT                                                          CALL               VALUE
  RATING*    (000)         DESCRIPTION                                    PROVISIONS+         (NOTE 1)
- --------------------------------------------------------------------------------------------------------
<S>        <C>       <C>                                                <C>                  <C>
                     LONG-TERM INVESTMENTS--144.9%
                     ALABAMA--0.3%
  AAA      $ 1,905   Mobile Impvt. Wt., Zero Coupon, 8/15/08, MBIA ...  8/02 at 71.587       $ 1,170,375
                                                                                             -----------
                     ARIZONA--0.6%
  AAA        4,000   Chandler, G.O., Zero Coupon, 7/01/08, FGIC ......   No Opt. Call          2,574,960
                                                                                             -----------
                     CALIFORNIA--0.4%
  AAA        1,890   California Hlth. Fac. Fin. Auth. Rev.,
                     Marin Gen. Hosp., Ser. A, 5.75%, 8/01/09, FSA ...    8/03 at 102          1,994,460
                                                                                             -----------
                     COLORADO--10.7%
  AAA        2,000   E-470 Pub. Hwy. Auth. Co. Rev.,
                       Ser. B, Zero Coupon, 9/01/11, MBIA ............   No Opt. Call          1,073,040
  AAA       30,205++ Jefferson Cnty. Sch. Dist. No. R-001,
                       G.O., 6.25%, 12/15/02, AMBAC ..................        N/A             32,360,731
  AAA       13,285++ Univ. of Colorado, Hosp. Auth. Rev.,
                       Ser. A, 6.25%, 11/15/02, AMBAC ................        N/A             14,329,599
                                                                                             -----------
                                                                                              47,763,370
                                                                                             -----------
                     DISTRICT OF COLUMBIA--5.5%
                     Dist. of Columbia, G.O., MBIA,
  AAA       17,950+    Ser. B, 6.30%, 6/01/02 ........................        N/A             19,200,577
  AAA          115+    Ser. E, 5.875%, 6/01/03 .......................        N/A                122,530
  AAA        2,955     Ser. E, 5.875%, 6/01/08 .......................    6/03 at 102          3,098,820
  AAA        2,000   Dist. of Columbia, Hosp. Rev., Children's Hosp.,
                       Ser. A, 6.25%, 7/15/08, FGIC ..................    7/02 at 102          2,109,000
                                                                                             -----------
                                                                                              24,530,927
                                                                                             -----------
                     GEORGIA--1.7%
  AAA        7,000++ Atlanta, C.O.P., Pretrial Det. Ctr.,
                       6.25%, 12/01/02, MBIA .........................        N/A              7,555,590
                                                                                             -----------
                     HAWAII--1.8%
  AAA        7,760   Honolulu, Cnty., G.O.,
                       Ser. A, 5.80%, 1/01/07, FGIC ..................   No Opt. Call          8,233,438
                                                                                             -----------
                     ILLINOIS--13.4%
  AAA       14,205   Chicago O'Hare Intl. Arprt. Rev.,
                       Ser. A, 6.25%, 1/01/08, MBIA ..................    1/05 at 102         15,296,370
                     Chicago Sch. Fin. Auth., G.O., Ser. A, FGIC,
  AAA       13,000     6.25%, 6/01/07 ................................    6/02 at 102         13,759,980
  AAA        9,150     6.25%, 6/01/09 ................................    6/02 at 102          9,654,257
                     Illinois Hlth. Fac. Auth. Rev., Ser. A,
  AAA       11,000++   Alexian Med. Ctr. Proj., 6.35%, 1/01/02, MBIA .        N/A             11,718,740
  AAA        2,500     Carle Foundation, 6.75%, 1/01/10, FGIC ........    1/00 at 102          2,572,700
  AAA       10,170   Met. Pier & Expo. Auth., Ded. St. Tax Rev.,
                       Ser. A, Zero Coupon, 6/15/08, FGIC ............   No Opt. Call          6,538,191
                                                                                             -----------
                                                                                              59,540,238
                                                                                             -----------
                     INDIANA--2.4%
                     Indiana Hlth. Fac. Fin. Auth. Hosp. Rev. & Impvt.,
                     Ancilla Sys. Inc., MBIA,
  AAA        5,665     Ser. A, 6.25%, 7/01/08 ........................    7/02 at 102          5,906,102
  AAA        4,350     Ser. B, 6.25%, 7/01/08 ........................    7/02 at 102          4,581,594
                                                                                             -----------
                                                                                              10,487,696
                                                                                             -----------
                     IOWA--1.1%
  AAA          865   Iowa Fin. Auth., Sngl. Fam. Mtge. Rev.,
                       Ser. F, 6.35%, 7/01/09, AMBAC .................    1/03 at 102            893,519
  AAA        4,195   Muscatine, Elec. Rev., 5.00%, 1/01/08, FSA ......    1/00 at 100          4,196,343
                                                                                             -----------
                                                                                               5,089,862
                                                                                             -----------
                     KENTUCKY--0.6%
  AAA        3,890   Owensboro, Elec. Lt. & Pwr. Rev.,
                       Ser. B, Zero Coupon, 1/01/09, AMBAC ...........   No Opt. Call          2,421,097
                                                                                             -----------
</TABLE>

                       See Botes to Financial Statements.

                                      5
<PAGE>
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
            PRINCIPAL                                                      OPTION
             AMOUNT                                                          CALL               VALUE
  RATING*    (000)         DESCRIPTION                                    PROVISIONS+         (NOTE 1)
- --------------------------------------------------------------------------------------------------------
<S>        <C>       <C>                                                  <C>                <C>
                     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            $ 5,374,800
                                                                                             -----------
                     MASSACHUSETTS--4.9%
  AAA        4,465++ Chelsea, Sch. Proj. Loan, 6.00%, 6/15/04, AMBAC .        N/A              4,830,326
                     Massachusetts Bay Trans. Auth. Rev., Ser. B, MBIA
  AAA          200++   6.00%, 3/01/03 ................................        N/A                214,088
  AAA        5,800     6.00%, 3/01/10 ................................    3/03 at 102          6,155,888
  AAA       10,000   Massachusetts St. Hsg. Fin. Agcy., Hsg. Proj.,
                       Ser. A, 5.95%, 10/01/08, AMBAC ................    4/03 at 102         10,531,100
                                                                                             -----------
                                                                                              21,731,402
                                                                                             -----------
                     MICHIGAN--4.6%
                     Lake Orion, Cmnty. Sch. Dist., AMBAC,
  AAA        3,290++   6.60%, 5/01/05 ................................        N/A              3,647,590
  AAA        3,285++   6.70%, 5/01/05 ................................        N/A              3,658,636
  AAA        8,920++ Michigan St. Bldg. Auth. Rev., Fac. Proj.,
                       Ser. IIA, 6.25%, 10/01/02, AMBAC ..............        N/A              9,603,450
  AAA        3,400   Wyandotte, Elec. Rev., 6.25%, 10/01/08, MBIA ....   No Opt. Call          3,728,916
                                                                                             -----------
                                                                                              20,638,592
                                                                                             -----------
                     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 at 102          7,700,228
                                                                                             -----------
                     NEVADA--3.9%
  AAA        6,490++ Clark Cnty. Fld Ctrl., 6.30%, 11/01/01, AMBAC ...        N/A              6,861,488
                     Washoe Cnty. Arpt. Auth. Rev., Ser. B, MBIA,
  AAA        3,135     5.70%, 7/01/07 ................................    7/03 at 102          3,274,695
  AAA        2,645     5.75%, 7/01/08 ................................    7/03 at 102          2,759,899
  AAA        4,135++ Washoe Cnty. Sch. Dist., G.O., Ser. A,
                       6.20%, 10/01/02, AMBAC ........................        N/A              4,409,564
                                                                                             -----------
                                                                                              17,305,646
                                                                                             -----------
                     NEW JERSEY--13.0%
  AAA       30,275   New Jersey Econ. Dev. Auth., Mkt. Trans. Fac. Rev.,
                       Ser. A, 5.80%, 7/01/08, MBIA ..................    7/04 at 102         32,071,216
  AAA       24,495   New Jersey St. G.O., Ser. D,
                       6.00%, 2/15/09, MBIA ..........................    2/03 at 102         25,761,146
                                                                                             -----------
                                                                                              57,832,362
                                                                                             -----------
                     NEW YORK--8.2%
                     New York City G.O., Ser. E, MBIA,
  AAA        5,000     6.125%, 8/01/06 ...............................   No Opt. Call          5,408,550
  AAA       15,500     6.20%, 8/01/07 ................................   No Opt. Call         16,885,235
  AAA        5,000     Ser. G, 5.75%, 2/01/08 ........................   2/06 at 101.5         5,275,700
                     New York St. Environ. Fac. Corp., P.C.R., Ser. D,
  AAA        5,945     6.50%, 5/15/07 ................................   11/04 at 102          6,579,331
  AAA        2,245     6.50%, 11/15/07 ...............................   11/04 at 102          2,484,542
                                                                                             -----------
                                                                                              36,633,358
                                                                                             -----------
                     NORTH CAROLINA--8.6%
  AAA        1,000++ Cumberland Cnty. C.O.P., Civic Ctr. Proj.,
                       Ser. A, 6.375%, 12/01/04, AMBAC ...............        N/A              1,104,720
                     North Carolina Eastn. Mun. Pwr. Agcy. Sys. Rev.,
                       Ser. B,
  AAA       13,500     6.125%, 1/01/09, FGIC .........................   No Opt. Call         14,693,670
  AAA        5,000     7.00%, 1/01/08, CAPMAC ........................   No Opt. Call          5,696,950
  AAA       14,675     7.25%, 1/01/07, CAPMAC ........................   No Opt. Call         16,815,789
                                                                                             -----------
                                                                                              38,311,129
                                                                                             -----------
                     NORTH DAKOTA--1.1%
  AAA        4,450++ Bismark Hosp. Rev., St. Alexius Med. Ctr.,
                       6.90%, 5/01/01, AMBAC .........................        N/A              4,751,087
                                                                                               ---------
</TABLE>

                       See Botes to Financial Statements.

                                       6
<PAGE>
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
            PRINCIPAL                                                      OPTION
             AMOUNT                                                          CALL               VALUE
  RATING*    (000)         DESCRIPTION                                    PROVISIONS+         (NOTE 1)
- --------------------------------------------------------------------------------------------------------
  <S>      <C>       <C>                                                 <C>              <C>
                     OHIO--2.3%
  AAA      $ 2,410++ Cleveland, G.O., 6.40%, 11/15/04, MBIA ..........        N/A         $    2,663,676
  AAA        6,095   Hamilton City, Elec. Sys. Rev., Ser. A,
                       6.125%, 10/15/08, FGIC ........................   10/02 at 102          6,482,947
  AAA        1,000++ Ohio St. Bldg. Auth. Fac. Rev.,
                     Juvenile Correctional Proj.,
                       6.50%, 9/01/04, AMBAC .........................        N/A              1,108,130
                                                                                             -----------
                                                                                              10,254,753
                                                                                             -----------
                     PENNSYLVANIA--14.4%
  AAA        4,000   Allegheny Cnty. Hosp. Dev. Auth. Rev., Magee
                     Women's Hosp.,
                       6.25%, 10/01/08, FGIC .........................   10/02 at 102          4,245,160
                     Dauphin Cnty. Gen. Auth. Hosp. Rev.,
                     HAPSCO-Western Pennsylvania Hosp. Proj., MBIA,
  AAA        5,000     6.25%, 7/01/08 ................................    7/02 at 102          5,274,750
  AAA       10,000     Ser. A, 6.25%, 7/01/08 ........................    7/02 at 102         10,549,500
  AAA        6,600   Erie Cnty. Hosp. Auth. Rev.,
                     St. Vincent Hlth. Ctr. Proj., Ser. A,
                       6.25%, 7/01/08, MBIA ..........................    7/02 at 102          6,962,670
  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          3,758,895
  AAA                Pennsylvania Hsg. Fin. Agcy. Rev., Rental Hsg.,
                       Ser. C, 6.25%, 7/01/07, FNMA ..................    7/02 at 102          6,822,725
  AAA        7,450++ Pennsylvania St., G.O., Ser. A,
                       6.50%, 11/01/01, FGIC .........................        N/A              7,942,967
  AAA        4,945   Philadelphia, Gas Wks. Rev.,
                       5.25%, 7/01/08, FSA ...........................   No Opt. Call          5,009,532
  AAA       10,930++ Pittsburgh, G.O., Ser. D,
                       6.00%, 9/01/02, AMBAC .........................        N/A             11,672,912
  AAA        1,665++ Scranton-Lackawanna Hlth. & Welfare Auth. Rev.,
                       6.90%, 1/01/00, MBIA ..........................        N/A              1,723,958
                                                                                             -----------
                                                                                              63,963,069
                                                                                             -----------
                     TEXAS--24.8%
  AAA       13,000++ Austin Pub. Impvt., G.O., 6.10%, 9/01/02, AMBAC .        N/A             13,693,940
                     Austin Util. Sys. Rev.,
  AAA       11,515     Ser. A, Zero Coupon, 11/15/08, MBIA ...........    No Opt. Call         7,232,456
  AAA        5,000     Ser. A, Zero Coupon, 11/15/09, AMBAC ..........    No Opt. Call         2,970,450
  AAA        5,000     Ser. A, Zero Coupon, 11/15/09, MBIA ...........    No Opt. Call         2,970,450
  AAA        7,000     6.25%, 11/15/08, AMBAC ........................    11/02 at 102         7,473,060
  AAA        5,000     6.625%, 11/15/08, AMBAC .......................    No Opt. Call         5,630,600
                     Baytown, G.O., AMBAC,
  AAA        2,385++   6.40%, 2/01/02 ................................        N/A              2,507,303
  AAA        2,840     6.40%, 2/01/08 ................................    2/02 at 100          2,963,824
  AAA        9,930   Circle C Mun. Util. Dist. No. 3 Rev.,
                       6.50%, 11/15/09, FGIC .........................   11/01 at 100         10,353,117
                     Coppell Indpt. Sch. Dist., MBIA,
  AAA        1,430     6.10%, 8/15/09 ................................         ETM             1,551,750
  AAA        2,495     6.10%, 8/15/09 ................................    8/02 at 100          2,594,052
  AAA        4,390   Houston Indpt. Sch. Dist.
                       Zero Coupon, 8/15/09, AMBAC ...................   No Opt. Call          2,609,855
  AAA       16,135   Houston Wtr. & Swr. Sys. Rev., Jr. Lien,
                       Ser. C, 6.25%, 12/01/09, MBIA .................   12/02 at 102         17,229,760
  AAA        6,000   San Antonio Elec. & Gas Rev., Ser. B,
                       Zero Coupon, 2/01/10, FGIC ....................   No Opt. Call          3,490,740
                     Texas Mun. Pwr. Agcy. Rev., AMBAC,
  AAA       15,000     Zero Coupon, 9/01/08 ..........................   No Opt. Call          9,517,950
  AAA       16,175     Zero Coupon, 9/01/09 ..........................   No Opt. Call          9,709,044
  AAA        5,900   Texas St. Pub. Fin. Auth. Bldg. Rev.,
                       Ser. B, 6.25%, 2/01/09, AMBAC .................   No Opt. Call          6,461,975
  AAA        2,275     Ysleta Indpt. Sch. Dist. Rev.,
                       Zero Coupon, 8/15/08, PSFG ....................   No Opt. Call          1,433,910
                                                                                             -----------
                                                                                             110,394,236
                                                                                             -----------
                     UTAH--1.2%
  AAA        3,500   Intermountain Pwr. Agcy. Rev., Ser. B,
                       6.00%, 7/01/07, MBIA ..........................   No Opt. Call          3,769,080
  AAA        1,550   Salt Lake Cnty. Mun. Bldg. Auth. Lease Rev.,
                       Ser. A, 6.05%, 10/01/08, MBIA .................   10/04 at 101          1,639,187
                                                                                             -----------
                                                                                               5,408,267
                                                                                             -----------
</TABLE>

                       See Botes to Financial Statements.

                                        7
<PAGE>
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
            PRINCIPAL                                                      OPTION
             AMOUNT                                                          CALL               VALUE
  RATING*    (000)         DESCRIPTION                                    PROVISIONS+         (NOTE 1)
- --------------------------------------------------------------------------------------------------------
<S>       <C>        <C>                                                 <C>               <C>
                     WASHINGTON--13.8%
  AAA     $ 12,850   King Cnty., G.O., Ser. D, 5.55%, 12/01/08, MBIA .   12/07 at 102      $  13,466,414
                     Snohomish Cnty. Sch. Dist., G.O., MBIA,
  AAA        2,235++   6.10%, 12/01/03 ...............................        N/A              2,422,382
  AAA        1,765     6.10%, 12/01/08 ...............................   12/03 at 102          1,878,525
  AAA        9,000   Washington St. Hlth. Care Fac. Auth. Rev.,
                     Virginia Mason Oblig. Group,
                       6.30%, 2/15/09, MBIA ..........................    2/03 at 102          9,535,050
                     Washington St. Pub. Pwr. Supply Sys. Rev.,
  AAA        3,000     Nuclear Proj. No. 2, 5.55%, 7/01/10, FGIC .....    7/03 at 102          3,099,480
  AAA       13,635     Nuclear Proj. No. 2, Ser. A,
                       6.25%, 7/01/09, MBIA ..........................    7/02 at 102         14,482,143
  AAA        5,550     Nuclear Proj. No. 3, Zero Coupon, 7/01/07, BIGI    No Opt. Call         3,760,569
  AAA        2,000     Nuclear Proj. No. 3, Zero Coupon, 7/01/08, BIGI    No Opt. Call         1,294,280
  AAA       11,000     Ser. A, 5.80%, 7/01/07, FSA ...................    No Opt. Call        11,686,290
                                                                                            ------------
                                                                                              61,625,133
                                                                                            ------------
                     WEST VIRGINIA--2.7%
  AAA       11,600   West Virginia St. Pkwys. Econ. Dev. & Tourism Auth.,
                       5.70%, 5/15/09, FGIC ..........................    5/03 at 102         12,028,388
                                                                                            ------------

                     TOTAL LONG-TERM INVESTMENTS (COST $598,822,334) .                       645,314,463
                                                                                            ------------

                     SHORT-TERM INVESTMENT**--0.2%
 A-1+          900   New York City Mun. Wtr. Fin. Auth. Rev.,
                       Ser. G, 3.40%, 7/01/99, FRDD (COST $900,000) ..                           900,000
                                                                                            ------------

                     TOTAL INVESTMENTS--145.1% (COST $599,722,334) ...                       646,214,463
                     Other assets in  excess of liabilities--1.1% ....                         4,998,619
                     Liquidation value of preferred stock--(46.2)% ...                      (206,000,000)
                                                                                            ------------
                     NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS--100%                     $445,213,082
                                                                                            ============
</TABLE>


- ---------------------
  * Using the higher of Standard and 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.


- --------------------------------------------------------------------------------

         THE FOLLOWING ABBREVIATIONS ARE USED IN PORTFOLIO DESCRIPTIONS:

AMBAC    -- American Municipal Bond Assurance Corporation
BIGI     -- Bond Investors Guaranty Insurance Company
CAPMAC   -- Capital Markets Assurance Company
C.O.P.   -- Certificate of Participation
ETM      -- Escrowed to maturity
FHA      -- Federal Housing Administration
FNMA     -- Federal National Mortgage Association
FGIC     -- Financial Guaranty Insurance Company
FRDD     -- Floating Rate Daily Demand**
FSA      -- Financial Security Assurance
G.O.     -- General Obligation Bond
MBIA     -- Municipal Bond Insurance Association
P.C.R.   -- Pollution Control Revenue
PSFG     -- Permanent School Fund Guaranty

- --------------------------------------------------------------------------------


                       See Notes to Financial Statements.

                                       8

<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
ASSETS
Investments, at value (cost $599,722,334)
   (Note 1) ...............................................        $646,214,463
Cash ......................................................              71,327
Interest receivable .......................................          10,139,867
Receivable for investments sold ...........................             435,000
Other assets ..............................................              22,811
                                                                   ------------
 ..........................................................         656,883,468
                                                                   ------------
LIABILITIES
Payable for investments purchased .........................           5,080,666
Advisory fee payable (Note 2) .............................             192,511
Dividends payable-preferred stock .........................             169,636
Administration fee payable (Note 2) .......................              55,003
Other accrued expenses ....................................             172,570
                                                                   ------------
 ..........................................................           5,670,386
                                                                   ------------
NET INVESTMENT ASSETS .....................................        $651,213,082
                                                                   ============
Net investment assets were comprised of:
  Common stock:
    Par value (Note 4) ....................................        $    272,071
    Paid-in capital in excess of par ......................         378,448,786
  Preferred stock (Note 4) ................................         206,000,000
                                                                   ------------
 ..........................................................         584,720,857

  Undistributed net investment income .....................          20,307,499
  Accumulated net realized loss ...........................            (307,403)
  Net unrealized appreciation .............................          46,492,129
                                                                   ------------
  Net investment assets, June 30, 1999 ....................        $651,213,082
                                                                   ============
  Net assets applicable to common
    shareholders ..........................................        $445,213,082
                                                                   ============
Net asset value per common share:
  ($445,213,082 / 27,207,093 shares of
  common stock issued and outstanding) ....................              $16.36
                                                                         ======



- --------------------------------------------------------------------------------
THE BLACKROCK INSURED
MUNICIPAL 2008 TERM TRUST INC.
STATEMENT OF OPERATIONS
SIX MONTHS ENDED JUNE 30, 1999 (Unaudited)
- --------------------------------------------------------------------------------

Net Investment Income
Income
  Interest and discount earned ............................         $18,483,668
                                                                    -----------

Operating expenses
  Investment advisory .....................................           1,165,961
  Administration ..........................................             333,132
  Auction agent ...........................................             275,000
  Custodian ...............................................              70,500
  Reports to shareholders .................................              57,500
  Directors ...............................................              42,500
  Audit ...................................................              20,000
  Transfer agent ..........................................              14,000
  Legal ...................................................               9,000
  Miscellaneous ...........................................              54,038
                                                                    -----------
    Total expenses ........................................           2,041,631
                                                                    -----------
Net investment income .....................................          16,442,037
                                                                    -----------

REALIZED AND UNREALIZED LOSS ON
INVESTMENTS (Note 3)
  Net realized loss on investments ........................              (1,614)
  Net change in unrealized appreciation
    on investments ........................................         (21,481,680)
                                                                    -----------
  Net loss on investments .................................         (21,483,294)
                                                                    -----------

NET DECREASE IN NET INVESTMENT
ASSETS RESULTING FROM OPERATIONS ..........................         $(5,041,257)
                                                                    ===========

                       See Notes to Financial Statements.


                                       9
<PAGE>

- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
STATEMENTS OF CHANGES IN NET INVESTMENT ASSETS (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                  Six Months Ended            Year Ended
                                                                                      June 30,               December 31,
                                                                                        1999                    1998
                                                                                  ---------------            ------------
<S>                                                                                 <C>                      <C>
INCREASE (DECREASE) IN NET INVESTMENT ASSETS
OPERATIONS:
   Net investment income ...............................................            $ 16,442,037             $ 32,566,277
Net realized gain (loss) on investments ................................                  (1,614)                 188,548
Net change in unrealized appreciation on investments ...................             (21,481,680)               2,943,199
                                                                                    ------------             ------------

       Net increase (decrease) in net investment assets
        resulting from operations ......................................              (5,041,257)              35,698,024
                                                                                    ------------             ------------
DIVIDENDS AND DISTRIBUTIONS:
To common shareholders from net investment income ......................             (10,814,603)             (21,629,248)
To common shareholders from net realized gain
  on investments .......................................................                      --                 (142,426)
To preferred shareholders from net investment income ...................              (3,167,330)              (6,836,065)
To preferred shareholders from net realized gain
  on investments .......................................................                      --                  (46,134)
                                                                                    ------------             ------------
         Total dividends and distributions .............................             (13,981,933)             (28,653,873)
                                                                                    ------------             ------------
             Total increase (decrease) .................................             (19,023,190)               7,044,151
                                                                                    ------------             ------------
NET INVESTMENT ASSETS
Beginning of period ....................................................             670,236,272              663,192,121
                                                                                    ------------             ------------
End of period ..........................................................            $651,213,082             $670,236,272
                                                                                    ============             ============
</TABLE>
                       See Notes to Financial Statements.

                                       10

<PAGE>


- --------------------------------------------------------------------------------
THE BLACKROCK INSURED MUNICIPAL 2008 TERM TRUST INC.
FINANCIAL HIGHLIGHTS (UNAUDITED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                    Six Months Ended                Year Ended December 31,
                                                         June 30,    ------------------------------------------------------------
PER SHARE OPERATING PERFORMANCE:                           1999         1998         1997        1996         1995        1994
                                                         -------     ---------     --------    --------     --------     --------
<S>                                                     <C>          <C>           <C>          <C>        <C>           <C>
Net asset value, beginning of the period .............. $  17.06     $   16.80     $  15.90     $ 16.08    $   13.88     $  16.23
                                                        --------     ---------     --------    --------    ---------     --------
  Net investment income ...............................    0 .60          1.20         1.18        1.17         1.19         1.15
  Net realized and unrealized gain (loss)
   on investments .....................................    (0.79)         0.11         0.78       (0.27)        2.21        (2.39)
                                                        --------     ---------     --------    --------    ---------     --------
Net increase (decrease) from investment operations ....    (0.19)         1.31         1.96        0.90         3.40        (1.24)
                                                        --------     ---------     --------    --------    ---------     --------
Dividends and distributions:
  Dividends from net investment income to:
    Common shareholders ...............................    (0.40)        (0.80)       (0.79)      (0.79)       (0.83)       (0.88)
    Preferred shareholders ............................    (0.11)        (0.25)       (0.27)      (0.25)       (0.28)       (0.23)
  Distributions from net realized gain on
    investments to:
    Common shareholders ...............................       --            --           --       (0.03)       (0.06)          --
    Preferred shareholders ............................       --            --           --       (0.01)       (0.02)          --
  Distributions in excess of net realized
    gain on
    investments to:
    Common shareholders ...............................       --            **           **          **        (0.01)          --
                                                        --------     ---------     --------    --------    ---------     --------
Total dividends and distributions .....................    (0.51)        (1.05)       (1.06)      (1.08)       (1.20)       (1.11)
                                                        --------     ---------     --------    --------    ---------     --------
Net asset value, end of period* ....................... $  16.36     $   17.06     $  16.80    $  15.90    $   16.08     $  13.88
                                                        ========     =========     ========    ========    =========     ========
Market value, end of period* .......................... $  15.38     $   16.13     $  15.25    $  14.50    $   13.50     $  12.25
                                                        ========     =========     ========    ========    =========     ========
TOTAL INVESTMENT RETURN+ ..............................    (2.21%)       11.21%       10.97%      13.56%       17.64%      (13.71%)
                                                        ========     =========     ========    ========    =========     ========
RATIOS TO AVERAGE NET ASSETS OF
  COMMONSHAREHOLDERS:++
Expenses ..............................................     0.89%+++      0.88%        0.92%       0.95%        0.95%        1.02%
Net investment income before preferred
  stock dividends .....................................     7.20%+++      7.10%        7.19%       7.32%        7.74%        7.80%
Preferred stock dividends                                   1.39%+++      1.49%        1.03%       1.64%        1.97%        1.55%
Net investment income available to common
  shareholders ........................................     5.81%+++      5.61%        5.56%       5.68%        5.77%        6.25%

SUPPLEMENTAL DATA:
Average net assets of common shareholders
  (in thousands)                                        $460,219      $458,993     $444,895    $434,692     $417,017     $400,555
Portfolio turnover ....................................        0%            0%          11%          8%          27%          64%
Net assets of common shareholders,
  end of period (in thousands) ........................ $445,213      $464,236     $457,192    $432,609     $437,470     $377,679
Preferred stock outstanding (in thousands) ............ $206,000      $206,000     $206,000    $206,000     $206,000     $206,000
Asset coverage per share of preferred stock,
  end of period#                                        $ 79,031      $ 81,339     $ 80,484    $ 77,501     $ 78,091     $141,670
</TABLE>


- ----------
   * Net asset value and market value are published in Barron's  each  Saturday,
     The New York Times and The Wall Street Journal each 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.
   # A stock split occurred on July 24, 1995 (Note 4).
   + 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,  if any, 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 of less than one 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 shareholders.
 +++ 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 shares.

                       See Notes to Financial Statements.


                                       11

<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.  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  a  pricing  service  which  uses   information   with  respect  to
transactions  in bonds,  quotations  from bond dealers,  market  transactions in
comparable   securities  and  various   relationships   between   securities  in
determining values. 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.

     Short-term  securities  which  mature  in more  than 60 days are  valued at
current market quotations. Short-term securities which mature in 60 days or less
are valued at amortized cost, if their term to maturity from date of purchase is
60 days or less, or by amortizing their value on the 61st day prior to maturity,
if their original term to maturity from date of purchase exceeded 60 days.

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 carry  forwards  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 generally
accepted  accounting  principles  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.

NOTE 2.  AGREEMENTS
     The Trust has an Investment  Advisory  Agreement with  BlackRock  Financial
Management,   Inc.  (the  "Adviser")  a  wholly-owned  corporate  subsidiary  of
BlackRock  Advisors,  Inc.,  which is an indirect  majority-owned  subsidiary of
PNCBank,  N.A., and an Administration  Agreement with Princeton  Administrators,
L.P. (the  "Administrator"),  an indirect,  wholly- owned  subsidiary of Merrill
Lynch & Co.,  Inc. The  investment  advisory fee paid to the Adviser 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 Adviser provides continuous supervision of
the investment  portfolio and pays the compensation of officers of the Trust who
are  affiliated  persons of the Adviser.  The  Administrator  pays occupancy and
certain  clerical and accounting  costs of the Trust.  The Trust bears all other
costs and expenses.

NOTE 3. PORTFOLIO SECURITIES
     Purchases and sales of investments,  other than short-term investments, for
the  period  ended  June  30,  1999,   aggregated   $6,236,992  and  $1,609,440,
respectively.  The federal  income tax basis of the Trust's  investments at June
30, 1999, was  $600,028,117,  and accordingly,  net unrealized  appreciation was
$46,186,346  (gross  unrealized   appreciation--$46,235,845,   gross  unrealized
depreciation--$49,499).


                                       12

<PAGE>



NOTE 4. CAPITAL
     There  are 200  million  shares  of $.01  par  value  common  common  stock
authorized.  Of the 27,207,093  common shares  outstanding at June 30, 1999, the
Adviser  owned 7,093  shares.  As of June 30, 1999,  there were 8,240  preferred
shares  outstanding  as follows:  Series  T28-2,060,  Series  R28-2,060,  Series
T7-2,060 and Series R7-2,060.

      The Trust may classify or reclassify  any unissued  shares of common stock
into one or more series of preferred  stock.  On November  23,  1992,  the Trust
reclassified  4,120 shares of common stock and issued 4 series of Auction Market
Preferred Stock ("Preferred Stock") as follows: Series T28--1,030 shares, Series
R28--1,030  shares,  Series R7--1,030 shares and series  T7--1,030  shares.  The
PreferRED  Stock  has  a  liquidation  value  of  $25,000  per  share  plus  any
accumulated  but  unpaid  dividends.  On May 16,  1995  shareholders  approved a
proposal to split each share of the Trust's Auction Market  Preferred Stock into
two shares and simultaneously  reduce each share's  liquidation  preference from
$50,000 to $25,000. The split occurred on July 24, 1995.

      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
offering  through May 17, 1994.  Thereafter,  rates on Series R28 reset every 28
days based on results of an auction.  Dividend  rates ranged from 2.50% to 4.01%
during the period ended June 30, 1999.

      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 shares, 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
     Subsequent to June 30, 1999, the Board of Directors of the Trust declared a
dividend from  undistributed  earnings of $0.06625 per common share payable July
30, 1999 to shareholders of record on July 15, 1999.

     For  the  period  July 1,  1999 to July  31,  1999  dividends  declared  on
Preferred  Shares  totalled  $551,456  in  aggregate  for the  four  outstanding
Preferred Share series.


                                       13

<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.


                                       14


<PAGE>


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

     YEAR 2000  READINESS  DISCLOSURE.  The Trust is currently in the process of
evaluating its information  technology  infrastructure for Year 2000 compliance.
Substantially  all  of the  Trust's  information  systems  are  supplied  by the
Adviser.  The  Adviser has  advised  the Trust that it is  currently  evaluating
whether such systems are year 2000  compliant and that it expects to incur costs
of up to approximately five hundred thousand dollars to complete such evaluation
and to make any modifications to its systems as may be necessary to achieve Year
2000 compliance.  The Adviser has advised the Trust that it has fully tested its
systems for Year 2000 compliance. The Trust may be required to bear a portion of
such cost  incurred by the Adviser in this  regard.  The Adviser has advised the
Trust that it does not anticipate  any material  disruption in the operations of
the  Trust as a result  of any  failure  by the  Adviser  to  achieve  Year 2000
compliance.  There can be no assurance that the costs will not exceed the amount
referred  to  above or that  the  Trust  will not  experience  a  disruption  in
operations.

     The Adviser  has advised the Trust that it is in the process of  evaluating
the Year 2000 compliance of various  suppliers of the Adviser and the Trust. The
Adviser has advised the Trust that it has  communicated  with such  suppliers to
determine their Year 2000 compliance  status and the extent to which the Adviser
or the Trust could be affected by any supplier's Year 2000 compliance issues. To
date, the Adviser has received responses from all such suppliers with respect to
their Year 2000  compliance,  and there can be no assurance  that the systems of
such suppliers, who are beyond the Trust's control, will be Year 2000 compliant.
In the event that any of the Trust's  significant  suppliers do not successfully
and timely  achieve Year 2000  compliance,  the Trust's  business or  operations
could be adversely affected. The Adviser has advised the Trust that it is in the
process  of  preparing  a  contingency  plan for  Year  2000  compliance  by its
suppliers.  There  can be no  assurance  that  such  contingency  plan  will  be
successful in preventing a disruption of the Trust's operations.

     The  Trust  is  designating  this  disclosure  as its Year  2000  readiness
disclosure  for all  purposes  under the Year  2000  Information  and  Readiness
Disclosure  Act and the  foregoing  information  shall  constitute  a Year  2000
statement for purposes of that Act.

     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 19, 1999 to vote on
     the following matters:
     (1) To elect three Directors as follows:

       Director                         Class           Term          Expiring
       --------                        ------           -----          -------
       Andrew F. Brimmer                 III           3 years          2002
       Kent Dixon                        III           3 years          2002
       Laurence D. Fink                  III           3 years          2002

     Directors whose term of office continues beyond this meeting are Richard E.
     Cavanagh,  James Grosfeld,  Frank J. Fabozzi, James Clayburn La Force, Jr.,
     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, 1999.

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

                                         Votes for   Votes Against   Abstentions
                                         --------    -------------   -----------
           Andrew F. Brimmer .......... 25,113,880        --           401,173
           Kent Dixon ................. 25,144,762        --           370,291
           Laurence  D. Fink .......... 25,157,836        --           357,217
           Ratification  of
            Deloitte & Touche LLP ..... 25,130,383     149,306         235,364



                                     15

<PAGE>



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

THE TRUST'S  INVESTMENT  OBJECTIVE:

The BlackRock  Insured  Municipal 2008 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  Financial  Management,   Inc.   ("BlackRock")  is  an  SEC-registered
investment  adviser.  BlackRock and its  affiliates  currently  manage over $141
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-one  closed-end  funds that are traded on either the New York or American
stock exchanges,  and a $25 billion family of open-end funds.  BlackRock manages
over 470 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  Adviser  to be of  comparable  credit  quality
(guaranteed, escrowed or backed in trust).

WHAT IS THE ADVISER'S INVESTMENT STRATEGY?
The Adviser 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 Adviser 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 Adviser
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 (in an amount up to 35% of the total  assets) to enhance the income
of the  portfolio.  In  order  to  maintain  competitive  yields  as  the  Trust
approaches maturity and depending on market conditions, the Adviser 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 last business day of the
month. For shares held in the shareholder's name, dividends may be reinvested in
additional  shares of the fund 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.

                                       16

<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.  In general,  the portfolio is typically  leveraged at
approximately 35% of total assets.

Leverage also increases the duration (or price  volatility of the net assets) of
the Trust,  which can improve the  performance  of the fund in a declining  rate
environment,  but can cause net  assets to decline  faster  than the market in a
rapidly rising rate environment.  BlackRock'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 BlackRock  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.

                                       17

<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,  The New
York Times 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.


                                       18

<PAGE>



- -------------------------------------------------------------------------------
                      BLACKROCK FINANCIAL MANAGEMENT, INC.
                           SUMMARY OF CLOSED-END FUNDS
- --------------------------------------------------------------------------------

TAXABLE TRUSTS
- --------------------------------------------------------------------------------

                                                       Stock            Maturity
PERPETUAL TRUSTS                                      Symbol              Date
                                                      ------           ---------
The BlackRock Income Trust Inc.                         BKT               N/A
The BlackRock North American Government
  Income Trust Inc.                                     BNA               N/A
The BlackRock High Yield Trust                          BHY               N/A

Term Trusts
The BlackRock 1999 Term Trust Inc.                      BNN              12/99
The BlackRock Target Term Trust Inc.                    BTT              12/00
The BlackRock 2001 Term Trust Inc.                      BTM              06/01
The BlackRock Strategic Term Trust Inc.                 BGT              12/02
The BlackRock Investment Quality Term Trust Inc.        BQT              12/04
The BlackRock Advantage Term Trust Inc.                 BAT              12/05
The BlackRock Broad Investment Grade
  2009 Term Trust Inc.                                  BCT              12/09


TAX-EXEMPT TRUSTS
- --------------------------------------------------------------------------------

                                                       Stock            Maturity
PERPETUAL TRUSTS                                      Symbol              Date
                                                      ------           ---------
The BlackRock Investment Quality
  Municipal Trust Inc.                                  BKN               N/A
The BlackRock California Investment Quality
  Municipal Trust Inc.                                  RAA               N/A
The BlackRock Florida Investment Quality
  Municipal Trust                                       RFA               N/A
The BlackRock New Jersey Investment Quality
  Municipal Trust Inc.                                  RNJ               N/A
The BlackRock New York Investment Quality
  Municipal Trust Inc.                                  RNY               N/A

Term Trusts
The BlackRock Municipal Target Term Trust Inc.          BMN              12/06
The BlackRock Insured Municipal 2008 Term Trust Inc.    BRM              12/08
The BlackRock California Insured
  Municipal 2008 Term Trust Inc.                        BFC              12/08
The BlackRock Florida Insured
  Municipal 2008 Term Trust                             BRF              12/08
The BlackRock New York Insured
  Municipal 2008 Term Trust Inc.                        BLN              12/08
The BlackRock Insured Municipal Term Trust Inc.         BMT              12/10



         IF YOU WOULD LIKE FURTHER INFORMATION PLEASE CALL BLACKROCK AT
         (800) 227-7BFM (7236) OR CONSULT WITH YOUR FINANCIAL ADVISOR.


                                       19

<PAGE>



BLACKROCK
DIRECTORS
Laurence D. Fink, Chairman
Andrew F. Brimmer
Richard E. Cavanagh
Kent Dixon
Frank J. Fabozzi
James Grosfeld
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 ADVISER
BlackRock Financial Management, Inc.
345 Park Avenue
New York, NY 10154
(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
919 Third Avenue
New York, NY 10022

     The accompanying  financial statements as of June 30, 1999 were not audited
and accordingly, no opinion is expressed on them.

     This  report  is for  shareholder  information.  This  is not a  prospectus
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

                                                                     09247K-10-9
                                                                     09247K-30-7
                                                                     09247K-20-8
                                                                     09247K-40-6
                                                                     09247K-50-5
[LOGO] Printed on recycled paper


THE BLACKROCK
INSURED MUNICIPAL
2008 TERM
TRUST INC.
- -----------------
SEMI-ANNUAL REPORT
JUNE 30, 1999


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