I have a Griffin iTrip that I've used for quite awhile with my standard video iPod. I now have a iPhone and tried using it. The good news is it charges it so I don't have to purchase a car charger for the iPhone but it doesn't seem to play through to the stereo. Of course the iPhone has it's own speaker but is it possible to get it to play through any of these car adapters? I was hoping it's as simple as changing a setting somewhere on the iPhone. If not maybe someday they will come out with models which support the iPhone if that's possible.