THOMAS - A public Library of Congress site that tracks and archives the progress of legislation and has a multitude of resources on congressional history and procedures.
House - The homepage for the United States House of Representatives with information on members, committees, hearings and schedules as well as education resources and visitor information.
Senate - The homepage for the United States Senate with information on members, committee hearings, and schedules as well as background on Senate history, rules and procedures.
C-SPAN - An interactive media site with video, radio, television feeds and transcripts of American and international legislative and political activities.