MDI port in car - I want more functionality than just attaching a dumb USB drive.
Haven't been able to find any actual technical specs on MDI - only a page of info badly translated from German, but pretty certain USB networking isn't an option.
Not sure if the mp3 player / iPod integration is also just mass storage - there's indication in the above doc that it's special, and if so emulating whatever that is would also work. (But I figured more effort finding how to do that with a Pi.)