I would love one of these... But it would cost more than my car. $3000.00 stereo, $300.00 car. :(
MacCentral has more details about Alpine's upcoming in-car iPod interface, including the single-greatest quote ever to slip past the lips of a VP of Marketing, "Consumers love a knob more than anything." I've been saying that for years.
The Alpine unit looks nice, though. I think the best thing is that it's part of a whole system, so that any Ai-Net-equipped head unit can interface with the iPod, including using the aforementioned knob to scroll through like you would with the iPod's built-in wheel. Better than iPod Your BMW, that's for sure.
Alpine's KCA-420i iPod Interface Available in September [Gizmodo]