What this guy has done with his Zune makes me drool and very jealous. I really would like to have a system like this in my car. It would be nice for the passenger to be able to watch a movie while I drive and when I'm driving around myself I could more easily utilize my Zune to play music. Maybe I'll do something like this eventually since I've wanted a line-in for my car stereo anyway.
How about all of you? Who's done something like this in their car? If you've integrated your Zune into your car stereo, show us some pictures!