there are many I go to but this one in particular is the mother load for some really obscure groovy 70's jazz. The guy finds out of print vinyl and rips them to mp3 and shares the entire album on his site. Really fun stuff

http://myjazzworld.blogspot.com/

My favorite thing about the music on Archive.org is that most of it can be streamed on demand. I was actually listening to a show by The Brew off of Archive before I saw this post! There's even a Worcester band or two on there (Uncle Billy's Smokehouse is up there, and I thought Collapsible Three was but I'm not seeing it any more).

Best part? ANY band can put their live shows up there, you just need to post permission on your website and send them the link.

Another option to check out for free, live (and legal) music is Further Network (www.furthurnet.org). It's a P2P that used to be the place for live shows until Archive.org came along and gave hosting for the same stuff. There's still some good stuff on there (like Frank Black and the Catholics, QOTSA, and Metallica ironically), but there's not much there anymore due to a lack of sources.

Sugarmegs (http://tela.sugarmegs.org/_asxtela/) has streaming shows in Real format for a ton of shows (BB King, Beatles, Bob Dylan, and many others). Supposedly you can also download these shows but I've never tried.

Nugs.net (http://stash.nugs.net/stash.asp) has a small handful of downloadable live shows, but the selection doesn't change. It's mostly jambands and jazz-jam bands, but Les Claypool is on there, along with Bruce Hornsby.

Yeah, Metallica even had a "Taper's Section" for the Black Tour back in '91-92! My friend showed me the "Napster Bad" cartoon, well worth seeking out if you were (even mildly) annoyed by Metallica over the Napster snafu!