Power supply should be irrelevant. Computers run on 12V DC (I think), so unless you're in an old 6V Beetle or 24V Land Rover, you should be okay.

Shut-down/Startup could be handled by a sleep function, as when you close a laptop's lid. The tiny draw by a sleeping computer should mean it wouldn't take much more power than, say, leaving your GPS plugged in the cigarette lighter.

FM Radio: I've seen simple USB FM tuners for the Mac... but I've had my FM disabled in my car for almost two years now, and haven't missed it once.

Touchscreen integration - That's not too tough, there are companies that make them for any OS... but finding one for a 7-9" screen is the tricky part. My Alpine D310 has the touch-screen, but I haven't figured out how to get it to talk to my Mac Mini yet. Once I get that, it's a simple matter of hookng it up, and telling the Alpine to treat it like the GPS unit.

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