Radiohead in cooperation with Apple just released some bits and pieces to their song "Nude" so that listeners may edit and remix them however they like. It's a really cool idea. I remember Beck doing something similar during his release of "Midnite Vultures".
It's always a good learning experience to dissect a song and I've been having a lot of fun listening to Jonny Greenwood's individual guitar parts as well as the isolated track of Thom York singing a cappella.
You can get the parts and listen to the different remixes here: