We've seen hints that Griffins iTrip was coming. Time to get excited! Not because I really care about an FM transmitter on my iPhone, but because it's one of the first cases of iPhone accessories controlled by an app.
By taking advantage of iPhone OS 3.0's app integration, the iTrip accessory let's you fiddle with your touchscreen rather than buttons on a tiny accessory:
Users connect iTrip to their iPhone or iPod touch running iPhone OS 3.0, open the app, and are greeted with a large, simple display showing tuning controls and a SmartScan button, Griffin's trademark technology that instantly locates the best available frequency.