The Motorola T605 integrated BT system does pretty much everything, including A2DP. However, the only car I know that is getting it any time soon is the 2008 Honda Odyssey.

http://www.motorola.com/motoinfo/pro...alObjectId=174

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input