i'm having a bit of a problem with my 3g S...when i connect to bluetooth on my car, 06 lexus GS 300...i can't seem to find a way to transfer my phone book from my phone to the car, anybody know how?

also, i remember reading that the 3g S has FM transmitter? are we able to use that as...for let's say...music?

This should be supported once you pair the phone and your car.

Look at the following link iPhone and iPod touch: Supported Bluetooth profiles to see what bluetooth profiles each iPhone model supports.

Regarding the FM radio. A FM radio receiver (not transmitter) is built in the same chip that offers bluetooth and wifi, but Apple has chosen not to enable it. If they can turn this on with software later and if they have wired up a path for an antenna (via the headphone cable) are questions we don't know answers for right now.