I'm playing with collaborative playlists on Spotify, inspired by bopeepsheep and James Moran - just now I'm listening to a list of cover versions that James started and other people added to. Flaming Lips do Life On Mars! Kirsty McColl does Days! (That's a Spotify link; it won't work if you don't have it. If you don't have it, you totally should. Free music, with just one short ad every 20 minutes or so. It's the new paradigm, man.)
I'm going to start my own playlist and solicit contributions and recommendations from you all, but I suspect I'll get more participation if I don't post it in the middle of the night on a Friday.