Guys, there is one thing I noted during testing but forget to mention:
Even though PBAP is obviuosly working in general, my N900 still shows my car as device type "freehand" and a little headphone symbol (my old symbian phone showed a little car symbol) and in the device properties/details only HFP and OFP are listed as supported profiles for my car.

Guess its just a cosmetic detail, but if one of you Guys finds a way to fix this it would be nice..