I am able to do A2DP Bluetooth Audio streaming using my standard Aux-In.

I bought this:

Amazon.com: Blackberry A2DP Stereo BT Music Gateway: Electronics

Works great with my Droid and iPad

__________________
Previous: 2002 X5 3.0 / 121,000 miles
Current: 2007 X5 3.0si / 93,000 miles