Science.gov shouldn't be underestimated. It may not have as many search field types as other databases like OSTI, but it's a federated search, meaning that it's searching over 40 government agency databases simultaneously (including OSTI).
As more and more technical reports are digitized through Google / library partnerships, many of them are showing up in HathiTrust : US Bureau of Mines, NASA, USGS, DOE and others. Users have created their own collections of HathiTrust records to pull together those related to science and technology: http://babel.hathitrust.org/cgi/mb
The NASA Technical Reports Server has extensive full text coverage (80-90%) for:
http://ntrs.nasa.gov

- NASA National Aeronautics and Space Administration
- NACA National Advisory Committee for Aeronautics (NASA predecessor)
- NIX - NASA image gallery
http://ntrs.nasa.gov
The Office of Science and Technical Information has an extensive digital archive of reports called the Energy Citations Database. 30% of the reports indexed include online full text.
http://www.osti.gov/energycitations
http://www.osti.gov/energycitations
TRAIL is a collaborative digitization project, currently between the Great Western Library Alliance and the Center for Research Libraries and hosted on the University of Hawaii - Manoa server.
As of June 24, 2009, their technical report archive focuses on reports prior to 1975 from the
http://digicoll.manoa.hawaii.edu/techreports/index.php
As of June 24, 2009, their technical report archive focuses on reports prior to 1975 from the
- Atomic Energy Commission (predecessor to US Dept of Energy),
- US Bureau of Mines, and the
- National Bureau of Standards.
http://digicoll.manoa.hawaii.edu/techreports/index.php
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