I think I'm going to get one of these:
http://www.ilounge.com/index.php/reviews/comments/griffin-smartdeck-intelligent-cassette-adapter-for-ipod-ipod/
It's just a tape adapter, but it allows you to use the fast forward and rewind buttons on the steering wheel to go forward and backward between tracks. Gonna put it in my 528i with the stock tape deck.
