[TiK]

I have absolutely nothing that's bluetooth, but that's the norm being that I'm pretty slow in getting the latest gadgets (i.e. I'm too cheap to shell out the big bucks for the latest tech stuff and wait 'til it gets real cheap)

My friend has his RAZR bluetoothed into his brand new 3-series BMW and whenever his phone rings while he's in the car, the car itself rings and displays the callerID info on the console monitor. You can then hit the button and take the call using the car's speakerphone. I thought that was pretty awesome, given that you don't have to do anything at all after the initial setup (i.e. no plugging the phone into the car when you get in, etc.).