Pretty cool. A lot of people already have similar applications. I can't remember the name for it, but the iphone has an app where you can point your phone at the stars & it will identify the stars/planets. You can also point the phone around toward the ground and figure out where such things are below the horizon. It also finds the ISS for you, etc.
edit: I agree with the analogy to QR code. I don't know how QR codes ever caught on (or really, even if they did. I don't know anyone who uses them.)