Record label Ghostly International has released an iPhone app where you can listen to their artists music dependent on your mood. It's a streaming radio station and mood-based music discovery tool, Ghostly Discovery is a free app for the iPhone and iPod Touch that lets you listen to the Ghostly International and Spectral Sound catalogs (full songs, nothing less) and share your favorites with friends.
I've seen this in the works and its mean. Makes me want an iPhone even more. I think I need to go work for Ghostly. These dudes are insane. Check out the video below to see how it works. Enjoy.
Ghostly International - Discovery iPhone