"Explicit Feedback" is a very important aspect to tune and personalize your radio.
Have you ever wonder how it feels to actually give [EXPLICIT] feedback to a playlist?
Using a cheap webcam that detects your hand gesture, the user can love/ban a track, and improve the playlist. Yeah! Middle finger and all that...
It uses Bandcamp.com API, to create a radio from an album a user has purchased (see http://bandcamp.com/ocelma )
-> Google Chrome Extension
-> Radio based on an album
...and provide literal [EXPLICIT] feedback with your hand!