A friend of mine (cheers Danno!) gave me the heads-up on this a few days back. Looks like that the Humble Bundle concept doesn't only apply to indie games but music too. What's awesome about this is that you can nominate any amount you want to get at least 5 albums of music.
Unfortunately, I'm not terribly interested in most of the music although the cream of the crop would undoubtedly be the superb Baba Yetu (Civilization IV's main theme) by Christopher Tin. Another song worthy of mention is the live version of Still Alive (Portal's theme song) as part of Jonathon Coulton's album.