Just got my iPhone 4 and I thought I would share my in car solution. I drive a Jetta Sportwagen. I had an aftermarket head unit installed. It has iPhone integration through a 30 pin cable. I didnt want exposed cables hanging out in the car, so I decided on a spec-dock from http://2point5.com The installer had to drill a hole at the bottom of the cup holder for the cable to pass through. Everything is hidden except for the black dock. It has a universal opening so I could insert the pocket that came with the SwitchEasy case I used on my old 3G. http://www.switcheasy.com/ I found though that on rough roads, the universal dock 30 pin connection through the custom SwitchEasy pocket didnt provide enough support for the phone. The phone would rock forward and back just enough to make me nervous and occasionally lose the audio connection with the head unit. The best solution I found was the Send Station dock extender. http://www.sendstation.com/us/products/dockextender/ Even though its a bit ugly when the phone is not connected, the phone is locked in tight. No more bouncing around. I now use it with the Incipio SILICRYLIC case for my i-4. In the pics, you can see some black foam tape I wrapped around the spec-dock. It tightens up the fit and gives a little cushion from bad road shocks to the phone. Ill probably need to replace the foam tape periodically, its getting a little ragged where it is exposed. Otherwise, I love the setup. Clean and secure.