It would be nice to have an interactive demo, because I think it would take a lot of getting used to. I guess on a phone you don't have to compete quite as much against touch-typing for the advertised "efficiency."
Take a picture of a bar code, it scans it and finds you the best prices online instantly. I could go to a mall with my phone, scan the crap I like...then just buy it all online and potentially save lots of money. Sounds like a game changer to me.
this one is pretty interesting.. probably would take some getting used to