Project Vote Smart: CongressTrack - Status of major legislation, Congressional voting record sampler, coverage of special Congressional elections, as well links to other sites offering information on the U.S. Congress.
Voter Information Services - Includes scorecards, voting records, and public interest group ratings for members of the U.S. Congress.
Congress Online Project - Examines the use of web sites and other forms of online communications by congressional offices.
Library of Congress - view the collections and exhibits, or search the catalogs for just about any book ever printed.