I'm a big fan of Pandora. I recently discovered this band called The Pineapple Thief, by starting a playlist with Radiohead. Their new album is one of my favorites of 2008. Very happy with that find.
The marketing company I work for is actually doing a promotion for Energizer and their role in the new Pandora message board. It's a cool place to get exclusive music content. You can check it out at:
Energizer Forum