I had some time to browse a bit and found this:
http://www.navtv.com/product/90/bmw09.html
(if the link doesn't work go to
www.navtv.com and then choose brand/year etc and "equiped with" Full color LCD. The device is called "BMW09")
apparently you can even connect a pc or any device with hdmi out.
somebody has done it with a f10 5 series and has a win7 pc displayed from the car screen.
http://f10.5post.com/forums/showthread.php?t=721774
though i wouldn't want to go that far this looks cool!
has anyone tried it with an x3?