Congress just got all 2.0ed over at OpenCongress (appropriately released in beta). It pulls together information from Thomas, blogs, news articles, and other places. It also says it has campaign contribution information for every member of Congress. The main page highlights the most recent votes as well as the most popular bills viewed on the site, covered in the news, and covered in blogs, which is very cool.
It seems a lot nicer than Thomas, but it only has this and the previous congress in there at this point, so there’s not much in the way of comprehensive information.