I bought this in December because I wanted to listen to Pandora/SlingBox without having to plug in my iPhone to the Aux/USB port under the armrest (A2DP ANYCOM FIPO BLUETOOTH ADAPTER AUDIO RECEIVER):
http://cgi.ebay.com/ws/eBayISAPI.dll...m=190398926219
Works great...once in a while I have to turn off my Bluetooth (from my phone initially when I get into my car) then turn it back on because of "skipping/pauses" but after the re-sync it works perfectly.
FYI...this device connects to the USB/Aux BMW cable (it has the same connection port as the iPhone). The BMW USB port has enough juice to power this device and syncs to the iPhone as soon as I sit in the car. If you have any questions...shoot me a PM.