Project VoteSmart's CongressTrack. Keep track of your member of Congress. See how members voted on bills, get biographical information, access the Congressional Record, and follow links to other congressional information services. Also find the status of current legislation and see how members are evaluated by interest groups.
http://www.vote-smart.org/congresstrack

Library of Congress. View current exhibitions and retrieve current news and events. A highlight of this home page is American Memory, which contains historical collections (viewable on the Web) for the National Digital Library.
http://www.loc.gov

House of Representatives. Retrieve information on current and recent legislation and information on members, committees, and other congressional organizations.
http://www.house.gov

Senate. Visitors can get information from and about Senate members, search the member directory, read about Senate history, and search a glossary of Senate terms.
http://www.senate.gov

Thomas. Named after Thomas Jefferson, this is the Library of Congress's congressional service. The site contains the status and full text of bills and laws and a wealth of other information regarding Congress.
http://thomas.loc.gov