This is one of the reasons that I stay at a convention until they kick me out. Guinness World Records only announced their app Thursday morning, and I found out about it because of a story in the Wall Street Journal that same day.
This app is just a sampler, but it does look interesting. There is also an iPhone version of the sampler coming soon. The full app is due out this fall, and they haven't set the price yet.
BTW, I'm sorry that the camera drifted. I 'm not ashamed to say that I got distracted by the demo. Yes, it was that cool.