Tim Finin of UMBC points to a paper on XPOD as a prototype portable music player that can sense a user's context -- what she is doing, her level of activity, mood, etc. -- and that to refine its playlist. The device monitors several external variables from a streaming version of the BodyMedia SenseWear to model the user's context and predict the most appropriate music genre via a neural network.
[thank you Tim !!]