alpine
I don't think I saw this mentioned yet (quick perusal), but what about the Alpine deck that has been announced (UK release this summer, I believe?). Supposed feature set sounds similar to what BMW may be offering:
TORRANCE, Calif, January 6, 2004 -- Alpine Electronics of America, Inc., the industry-leading manufacturer of high performance mobile electronics, will demonstrate at CES the world's first solution that enables consumers to connect and control their iPod from their in-vehicle sound system. Alpine's iPod Ready strategy is part of the company's overarching mission to create innovative in-vehicle electronics that are easier to use and provide great sound in the mobile environment.
"The integration of iPod control into selected 2004 Alpine in-dash receivers addresses the growing market of portable digital audio device users who want a safe and easy-to-use solution for playback in the car." said Stephen Witt, Alpine's vice president of Brand Marketing.
...