Electronics retailer Crutchfield launched a neat tool dubbed digital drive-thru that suggests based on your car model and configuration the best way to connect your iPod.
First you select your type of iPod (or non-iPod) and then you specify year and make of your Car. Crutchfield has 10,000 cars and car stereos in the connected database.
I tested it the service for a 2001 3-series BMW with factory installed car stereo. The service recommended the USA SPEC iPod Interface (photo) that connects to the CD changer port of the car stereo.
For a 2006 Mini Cooper with Navigation system Crutchfield recommends the Harman Kardon Drive + Play. You can try the easy to use and well implemented Crutchfield digital drive-thru here.
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