[LocativeMedia] pdpal: mapping personal relationship to space

pdpal is "a mapping tool for recording personal experiences in public space". Yes, it is another location-based annotation tool that aims to be an "emotional gps". As usual, I am wondering if it is really used. The only successful program I know is Urban tapestries. There are so many tools like that these days... it this the locative media killer app? I dunno but I do think it can go much forward. The 'pokecon' thing described by Bruce Sterling in A good old-fashioned future seems a more promising target. Dodgeball is close to this, but is it really used by a large audience? Is the SMS the only cell phone killer app?