Some time ago, I mentionned that my friend would install a system to play my usb stick / hard disk. Well, it's finished. This is the system :
http://www.parrotshopping.com/us/p_p....aspx?i=180738
Works GREAT !!! USB, Iphone/Ipod, flash card, hands free phone, ...
Keep using volume buttons on the steering wheel and of course plays through the BOSE sound system. And, I can still use the standard radio / cd player.
Here's some pics :

color screen

remote control (operats phone, playlist, shuffle, ...)

usb , iphone, hard disk hook up, hidden in glove compartment

another shot of the screen

phone speakers, hidden behind my buddy Pinhead ; )
screen
Frenzy
Belgium