Justin Riley shows off us, on his custom iPad mount, how you can easily control some basic iPad functions with lots of gestures. After you do the quick 2 minute jailbreak (you wanted to do it anyway) you can enable a plethora of gesture controls. Slide from bottom up, top down, from status bar, tap and hold, pinch and even shake. And you can actually assign these gestures to anything you want.
So you basically end up with a 9.7 inch touch pad, which IMO is easy to use w/o looking at the screen at all. Drive Responsibly™.