There is a good thread -
http://www.e90post.com/forums/showthread.php?t=30079
The retrofit kit doc is also posted on the forums. If you do a search for MOST IPOD there are loads of posts/info.
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E91 330d SE - Sparkling Graphite/Black Dakota/Auto/Aluminium Trim/Front Seat Heating/Full Electric Sports Seats/Anthracite Headliner/Comfort Access/Xenons/Bluetooth/USB Audio/Double Spoke 161's
(Previously, E92 335d SE - sob sob as we had to part)