I just installed a padholdr.com kit in my Range Rover. It is much smaller than the first ipad mount I made myself and looks much cleaner. I bought the new 3g ipad and the navigation works great! I also now have a traffic app that even shows highway cameras. The audio syncs up to my car via bluetooth.
PadHoldr - Car Accessory That fits the iPad
PadHoldr - Car Accessory That fits the iPad