Radiohead's pricing of their new album In Rainbows is, to me, one of the most interesting business developments in music for awhile. Pay as much or as little as you want, but at least 1 cent for the album plus 45 cents for credit card processing.
I think it would be even more interesting to see the effects of open pricing on major label music that sales wise is a bit down the long tail. And sell the album on iTunes or Amazon. I think such a move would create more economic value than having open pricing on one newly released album from a big artist.