RNS-E
www.navplus.com - that is a great resource for this kind of thing. People (me included) have installed a DLO Home Dock deluxe with a IMA Plus adapter from Kufatec in Germany (full steering wheel control)
Takes some work but it works with ipods and the iphone 3G
I now have the iphone 3G connected tot he RNS-E with the DLO Home dock and play music while I take calls through the bluetooth interface
http://www.youtube.com/watch?v=lCfrWP_JR60
if you want to see a video of this working on a 2003 Allroad (A6 C5)





