no but I do know of one that goes in the cigarette lighter, it comes with a remote for the iPhone too! It cradles and charges and sends your music to your aux port. here: http://us.kensington.com/html/14493.html
Arkon has several car mounts, all of which are compatible with the original and new 3G iPhone. Here are the ones that would allow for 360 degree rotation. Model SM220 features a 9" windshield suction pedestal that has a 360 degree swivel head. However, at 9" in length, it's somewhat large. There's actually a YouTube video put out by AT&T that shows the ARKON SM220 holding the 3G iPhone. See
I recommend model SM215 which uses ARKON CM014-KST-2 pedestal. It's called the Travelmount. That pedestal is the same one that is sold with many of the leading PND / GPS bundles in the original box.
Arkon's Air Vent Mount, which now includes "removable" air vent clips also has the 360 degree swivel feature. For many cars, the air vent is an ideal location, especially in California and Minnesota where using windshield mounts is currently banned.
The SM228 Adhesive Dash Mount also turns 360 degrees... actually it adjusts in a whole bunch of directions. It's an adhesive mount though, so only use this one if you don't mind adhering something to your dash.
The SM227 Bike Mount also has the 360 degree rotation swivel head. It's recommended if you us this one to create your own fastening strap to insure that your phone doesn't go flying out of the cradle.