My opinion-> aGPS = excellent feature for a phone which is frequently indoors....useless in a car.
iPhone as a nav device just makes me laugh so ill save the commentary. openMobile could be ported to the ipad in about a week of development with monotouch-but I would never do it.
Why is this even a debate,
How many of us use tablets for carpc's, Very few, now why is this any different other than the fact your are tied to iphone apps for software?
Here is a better question, rather two questions to solve one problem...
Would you use a tablet PC in your carpc install?
If so would you use an ipad?
openMobile is already designed to split out and map platform specific functions...so its really no different then adding linux or osx support was.
The big problem is that all the plugins would need to be compiled with monotouch, which at $400 is not a cheap task.
I'm going to be installing the Ipad as the "brain" of my in car multimedia while still having the in dash Ipod touch. My hope for the future is that once its jailbroken, an app like VNC can wirelessly control the Ipod. Since(for now) there is not alot of storage space on the ipad, I will utilize the space already being used on my Ipod. My other reason for using the Ipad in car is for apps like Dashcommand in full screen glory. I'm sure once you see it in action it will all make sense.
I think the ipad will be a great computer for the car, I have a iphone 3gs and it works great for me. I love all the different app it has, I think the only problem with the ipad is installing it and removing it, from the car.
Unfortunately, I gotta have fast real multitasking, so at this time - no IPad.
I'm so confident, I'll even let you tell me exactly where you want the faceplate of the dock to be located, and build to spec.