Science.gov [2.0]: FirstGov for Science - Government Science Portal
This portal search page has be re-launched with expanded search tools. I wasn't terribly impressed with the last incarnation. Usually I'll access NTIS through DIALOG or now through Engineering Village 2 (yes, I hate the big E, too, but this is a really nice search interface) and if I don't find it there, I'll try
DTIC's STINET or one of the agency's sites. Maybe this is better for the general public, though? (pointed out by
Gary Price)