Just wondering if something like this exists:

A tablet style PC, maybe 7-10", with an available permanent mount car dock. The car dock would have audio in/out cables, USB, power, etc. Basically, what I'm thinking is that as soon as you slip the tablet into the dock, it's connected to the car, with no individual cables to plug in.

I have a car mount for my HTC EVO, which has the power built in. I just slide the phone into the cradle and it's automatically hooked to the 12v power.

Has anyone seen anything like this out there?