I don't know if I posted this but it deserves repeating.
Bring http://www.slacker.com/ up on your blackberry and plug it into your car uax input. It'll either be 2.5/3.5mm audio jack, or rca jacks.
You put a band you like, and other bands similar will play. You can press approve or block for various song.
You get satellite rdio for free and better music.