Thomas: Legislative Information on the Internet
Thomas is an electronic monument to the principle that a free people are capable of governing themselves and offers a wealth of information.
You can keyword search the Congressional Record for the 101st-112th Congresses (1989-present), major legislation, Public Laws (1973-present; 93rd-112th Congresses) and more.
The site also includes searchable historical documents including the Declaration of Independence, the Federalist Papers, early Congressional documents (Constitutional Convention and Continental Congress broadsides), and the Constitution with the Bill of Rights and amendments.
If you're looking for anything governmental, try the Library of Congress's Government Resources
: Legislative, Executive, Judicial, State, Local.
If you're looking for contact information for a member of Congress, try Thomas's online directories: House
If you're feeling the need for a civics lesson, check out How Our Laws Are Made by Charles W. Johnson, House Parliamentarian and Enactment of a Law by Robert B. Dove, Senate Parliamentarian.