A friend has a PhatBox in his BMW. It works amazingly well considering the limitations of the interface, he can pull up a song as fast as I can on the Empeg. It's a passable solution if you don't want to pull out your head unit in your nice new luxury car.

What kills the PhatBox is it's not hackable. Why don't they let you swap out the drive yourself? Why doesn't it have serial/ethernet? They're really losing out on a good end-user development community like the Empeg has. Though it does play Vorbis, which the Empeg doesn't do yet.