Wired Mag's Creative Commons CD
A 320kbps MP3 version of November 2004's freely distributable Wired Magazine cover CD - includes Beastie Boys, David Byrne, Dan The Automator, Gilberto Gil, Cornelius, and many more Creative Commons-licensed tracks for remixing, spreading - unmissable.
I got this with my issue of Wired this month. It has a little bit of everything and well worth getting. Plus it's legal and free; best of both worlds.