Ipods are teh win.
I cant wait until Alpine releases their Ipod connector for their head units. You will be able to stash your Ipod somewhere in the car and manipulate the folders through the head unit.
Sorry for the hijack but I'm excited.
Scoobymods has a write-up on how to attach a cassette adapter to your car and run the wiring behind the head unit so that it isnt all over the place.