A kung fu fighter in a disco

I think it's only a matter of time (not MP3 blogs as we understand them but sites with tracks and streaming media and clips) - they go to Amazon and look at the star ratings and listen to clips, for instance. last.fm is a bit less generalist but still pretty general. The kids on the bus rely on real-life social networks rather than P2Ps but they're not reliant on gatekeeping critics, usw.