Significantly updated both aesthetically and functionally from Griffin's prior iTrip Auto, the new iTrip Auto with SmartScan ($80) is a combination FM transmitter and car charger that uses a super-bright OLED screen and three buttons for tuning. The most interesting new feature is a two-click automatic station finder, which searches your local FM dial for empty stations, tunes iTrip Auto to one of them, and transforms three into presets. Once it's…