Seems like VW jumped on the good band wagon with this one. This was coming out while I was still at the local stereo shop in Dover about two and a half years ago. The price keeps coming down and it looks interesting.
On that same page is the source for a FM input system so you can use this item on any vehicle.
Here is an even better alternative. Hook up a DC to AC transformer and from that put in a basic computer. Get a large hard drive and a video card with RCA outs. Get a wireless keyboard and wireless trackball mouse. Hook the video card up to the screen. If you get the screen on ebay you can get it for just around $100 USD. You could do all of that for cheaper than the PHAT BOX's asking $800. All in all the PHAT BOX is just a kenwood Music Keg badged by VW. Or at least that is what I have heard.