Research Links:

Catalog of United States Government Publications

Clusty - USASearch.gov

Data.gov

The purpose of Data.gov is to increase public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government. It includes hundreds of thousands of raw data feeds from various government agencies.

FDsys- GPO Access

Google U.S Government Search

GovSpot

GPO Access

Is immigrating to FDsys and the project should be finished by late 2009.

Law.Gov

Science.gov

THOMAS

USA.gov

USA.gov: Reference Center and General Government