From the National Archives:
New Web Harvest Online: 109th Congress
What does it contain?
More than four million pages (42 GB) crawled and archived between 11/11/06 and 12/11/06
Browse by Members Name
Browse by Committee Name
Browse by Leadership
Browse by House or Senate Organizations
The crawl was done using The Internet Archive’s open-source Heretix Crawler.
Learn More about the 109th Congress Web Harvest
Dr. James Billington, Librarian of Congress, recently told a U.S. House Committee, that the average life of a web site is between 44 and 75 days.
Sources: NARA and The Internet Archive