Hi.

I'm a lucky man with a N900 prototipe and I can confirm that the N900 NOW works with my CAR with an integrated bluetooth stereo ( I have a ford focus with a standard bluetooth module ).

The sounds quality is perfect ( in the 2 ways )... bettere than the iPhone :-)
When anyone call me and the number is registred I can see the name on my car's display, but ... i can't yet browse my phonebook on the car's dislpay.
So ... If i can see the name of the person who is calling me I think that when it is released next software update will include the ability to browse the phonebook.