App to make USB act like iPhone?

[johninbigd]

I had an iPhone until I got the Droid yesterday. I absolutely love the Droid and would never go back to an iPhone. However, the iPhone integrated well with my car radio, which has a USB port. The radio can play from USB, but then I have to navigate my folders from the radio. It's difficult, unintuitive, and less functional than playing music directly from the phone.

Is there an app that would fake out a connected device to make it think the Droid was an iPhone, and would let me use the Droid's music player interface to play music through the USB?