Visteon is coming out with an MP3 Juke that will be a plugin replacement for the CD changer in our vehicles. I've verified this with the local Visteon dealer. Here are a couple websites on it. Pretty cool.
http://www.visteon.com/technology/au...mach_spec.html

This is the company who also has a hand in it, gives a little more info.

http://www.phatnoise.com/

I plan on getting one for my current 4000 song mp3 collection and hooking it in concurent with my changer, switch between the 2 with a switchbox affair.