I recently stumbled upon this wonderful site. One can track Bills, Senators, Representatives, etc. One can track by catagory, get email alerts and figure out exactly what stage a certain bill is in. They can easily figure out who voted for what, too. It's a good tool for keeping up to date and being in 'the know' http://www.opencongress.org/
THOMAS (Library of Congress) is the government's own site, and in my experience is updated far faster than external sites. Just beware of the expiring links.