In honor of this week's release of "Nude" as a single, Radiohead are making the "stems" (drums, vocals, guitar, bass, strings/fx/misc.) available for your remixing pleasure. But...you have to buy them. All five of them. From iTunes. In iTunes Plus format. What, no FLAC?
Anyway, once you've purchased the song stems, you're free to remix it as you please, and you can create a widget for your Facebook or MySpace page to encourage your friends to vote for your remix. Popular ones end up here, where they awkwardly load forever and don't play, because Radiohead apparently hasn't learned their lesson yet about bandwidth. Ah well.