Just thought I'd pass on the info. The Alpine Interface Adapter for iPod (model KCA-420i) enables users to experience superior sound tuning and control of their iPod music using any of Alpine's 2004 Ai-Net in-dash head units. It's a hide-away design and can be installed anywhere in the vehicle -- under a seat, in the glove box or behind the dash. A single cable connects the adapter to the Alpine head unit, while a second cable connects the adapter to the iPod through the iPod dock connector. When the vehicle is on, the Interface Adapter also charges the iPod's internal battery.
The KCA420i is expected to ship in late September....
Since Apline is OEM BMW, the adaptor isn't really a surprise....
Chris