Added Bluetooth PBAB protocol support is definitly a feature I would LOVE to see in the near future!!!
And for sure a MUST for a wanna and hopefully soon to be leading smart phone / tablet (whatever you wanna call it - hate this discussion!)

Keep going Maemo community and make the N900 an even better mobile device - great job you guys are doing!

@Uwe: As a workaround you can import your adressbook to your BMW via the iDrive Online Portal: https://www.bmw-online-portal.de.
This way you can access your contactlist over iDrive in your car and use your N900 for calls...