so I just got this
widshield-mounted dock today and I must say it is very awesome.
When docked, the phone recognizes its in a car dack and displays a custom "home" screen with big buttons to get to the navigation, music and voice search. My phone can now officially replace a stand-alone GPS. Also, it has a 1/16 audio jack that plugs into my car so I can stream apps and internet radio through my car radio (which is good since I'm dropping XM.)
An added bonus, aside from the very scary temptation of watching netflix movies while I'm driving, is the fact that the dock doesn't cover the 8mp camera and I can record where I'm driving -- in effect, a dash mounted camera! oh the possibilities