The beta version of Congress.gov (which will eventually replace the Thomas legislative site), includes:

Legislation
"from the 107th Congess (2001) to the present"

The Legislative Process
"... contains fun and educational videos that provide a basic outline of the steps involved in the legislative process. These videos include: overview of the legislative process; introduction and referral of a bill; committee consideration; calendars and scheduling; House floor; Senate Floor; executive business in the Senate; bicameral resolution; and presidential action."

Profiles of members of Congress
"93rd Congress (1973) to the present, and some member profiles from the 80th through the 92nd Congresses (1947 to 1972)."

"Future Plans

Additional data will be incorporated over time. The Congressional Record will be included next, followed by other data, such as the Congressional Record Index, Congressional reports, House and Senate Calendars, nominations, treaties, and communications."