Somehow I can’t even imagine an app like this for the Blackberry. With the advent of Google’s voice-based search and Smule’s Ocarina, the iPhone changes the whole dynamics of human-computer interface. The range of gestures and inputs change dramatically with the microphone, camera and acceleromoter. Machines have learned to understand more than mouse and keyboards. It’s not a phone, phones don’t do this kind of thing. The street, definitely, finds its own uses for things.