Car stereo that connects to ipod as if it were a bluetooth headset.
There are lots of car stereos that will act as a speakerphone for your iphone. I want to be able to get in my car, hit the blue-connect button on my car stereo, and start playing music from the ipad, without having to take it out of my gear-bag, just like how it auto-plays when I turn on my bluetooth headset.