http://www.archive.org/audio/

It's called "Live Music Archive" and has tons of free downloads of all sorts of music. I haven't done much with it so far, but I'm going to find the time soon.

Also, here's a link to a bunch of bands that can be found on the site:

http://www.archive.org/audio/etreeli...da7d49b42d226f

Enjoy,

Swish