I?d like a list of any possible competitors that use mobile technology
(particularly cell phones) that have implications for corporate
team-building, tourism, or gaming competitions that take place by
overlaying the virtual world on top of the "real world".  Some
examples of such applications include TheGoGame.com and Verizon
Wireless Urban Challenge.

Bonus points (and big tip) for telling me their estimated annual
demand in users and revenue, except Urban Challenge, which I already
know.