The app and this writeup of it are both awesome.

A friend pointed me at Turntable today and I hung out there all afternoon at work -- it's a great replacement for Pandora for coding music. The human factor keeps it unpredictable and you can jump between rooms to get a different genre or mood when you feel like it.

I'm hooked already, and I'm rather pleased to read that they've already ironed out most of the licensing issue.