This one looks very interesting: Funky Remixes: “A Free and Legal Music Source | Free Remixes… Listen, Download, Rip, Remix and Share: artists like the Beastie Boys, Chuck D, David Byrne, Paul Westerberg and many others are mixing up the copyright laws of music. They want you to have free access to music.
Why? To allow fans and musicians to rip, remix and share music, free and legally, in support of ongoing music creation, promotion and evolution.
A copyright revolution, fueling a music evolution.”
The site seems young still, but looks like it will be worth following, although I prefer sites with remix packs rather than only finished mixes. Found a great David Byrne tune there.