In one of our demo's at the moment we have the new Bluetooth touch phone kit, which is a Volkswagen genuine accessory. The iPhone works with it and of course it's integrated into the stereo unit.

I like it, you control your phone from the touch screen or via voice commands, your contacts are imported into it (but not stored on it so once you disconnect they are no longer in the unit, which I also like) and it works well.

Here's a picture of the screen: