2. DLO Transdock (or transdock micro) - This is an FM transmitter, and the only one that I tested that actually works good with the iphone. It has a nice built in cradle that charges and transmits and Unlike the kenwood ipod integrator you can freely control the ipod section directly from the iphone screen. It also has numerous other features like USB in and Auxillary in/out. This means you can integrate any other device that has a headphone jack. And you can pipe out video to your car's video system if you have one.
The drawback to this device, is that you have to rely on FM signal unless you have an auxillary in on your car or an rca adapter in the back of your headunit.
What is the quality of this? Does it have much static? Do you have to put the iPhone in airplane mode? Does it pop up with an error saying that the iPhone isn't compatible with it like it does for some accessories? Does it fit snug?