http://www.house.gov/

http://www.senate.gov/

And if you want live streaming audio of Senate committee hearings, here is another site, courtesy of the fine folks at C-Span.

http://www.capitolhearings.org/

And to toot my own horn (or at least that of my employer), here at the Rutgers University Law School Library in Camden, NJ we are working on a massive project of digitization of Congressional hearings. We have about a million pages up so far, but there are many more where that came from. Some of these hearings are pretty mundane, but some interesting ones do go by me on their way to the scanners. This is older materials, as within the last couple of Congresses the Government Print Office is releasing them in digitized form; but they don’t have the resources to go back and make all the old stuff available on the internet. That’s where we Depository Libraries come in. We are working with some of our peer institutions to forward the project. You can access what is available by visiting our site and clicking in the “More New Online Resources!” box.

http://lawlibrary.rutgers.edu/index.shtml

If only.