Crosbie, it strikes me that this would be a natural place for a tip jar or pledge page. The one thing is that I don’t know how much users will go back to this page once they download an MP3, so it has to have stickiness.
Jay, it would be amazing if the page were used instead of album art. You’d see it in Cover Flow and have it displayed in the player while the song was on. That would do a lot for musicians, since they could have a upsells related to the music (ads, mailing list signup, Myspace friending, tips…).