Check out my 2010 Ford Mustang Sport Edition. It came loaded with Sirius radio. It also had Bluetooth and Microsoft Sync. So my car essentially became my phone when I was in it. "Dial John" dialed up John for me, and no headset or handset needed. The microphone was up by the mirror, and John's voice floated out of the speakers. Later on, as I was tooling down the road, the phone rang again. The radio automatically mutes and switches to phone mode. The display reads "Answer?" and you just hit the OK button. For the duration of the rental, my address book was resident in the car, and everytime I got in, it would sync to my blackberry phone. Totally AWESOME.
As fun as it was to drive, it's not a practical car. Miniscule backseat, trunk difficult to load and unload. Wonder what I'll be driving tomorrow!