So I'm looking for a kit for my car which would integrate the music from my iPhone as well as calls coming in to the speakers into my car. Ideally I want something that all I would need to do is plug in my phone through the bottom usb plug and all audio would be transmitted to my car speakers. Also when I receive calls the music would be interrupted so that I can take the call. The device would also need to have some sort of a microphone to pick up my end of the conversation in a phone call. Is there such a thing yet? I've looked online but I'm not quite sure if some of the products I've seen are fully compatible with my 3G iPhone. Thought I would ask my Mac rumours peeps. Any help would be greatly appreciate.