LOUIS (Congressional hearings, reports, bills and resolutions, Congressional Record, Presidential documents, Federal Register and GAO reports, all full-text from 2001 to present)
EUCLID
(library catalog)
Google
U.S. Government Search (though sometimes plain
old Google is
better)
GPO
Access (Government Printing Office)
Subject
Index to Government Information on the Web
Catalog
of U.S. Government Publications