POTUS iPhone App
Not that POTUS, but the band The Presidents of the United States of America have a very interesting iPhone app. For just $3, you can get a complete boxset-worth of material, including unreleased tracks and rare images.
The tracks are copy-protected, and self-contained within the app, so it has limited value - you can't mix these tracks into your iTunes library. Kind of a PITA, but still an interesting twist, especially if it's your favorite band of all time, and the only band you'll ever want to listen to. --Leslie Shapiro