To quote another on the iPad:

"A portable compute device of 9-12" screen size can do so many useful things in a car, boat or plane. Slot it into the vehicle and have it be the instrumentation. Maintain service records and log readings of oil pressure, temperature, all those important indicators. Do your navigation and pilot log duties.

Yes, a laptop can do the computer and display stuff, but only if you can find a way to mount it so that the silly great lump of case & keyboard doesn't get right in the way. And using a keyboard in the car/boat/plane isn't such a great a idea, whereas a touch screen can be made to work quite nicely thank you."

Check it out:
http://apple.com/ipad

Yea, the iPhone screen is a little small for the job, but also works in a pinch. The bigger screen in the iPad really makes all the difference, and it's a touch screen. Something like this should be built-in to the Camaro, 2011 maybe!?!