I read this and thought it had something to do PhoneTag, the GPS-based game that Ben Affleck and Matt Damon's company, LivePlanet are developing for Amp'd Mobile. The exclusive WSJ published a whole article about GPS games on mobile phones saying that PhoneTag should be available in July. [Full article was available here.]
"Amp'd Mobile users will be able to invite a circle of friends to join in a game of PhoneTag by sending text invitations to their cellphones, or to participate in a game with strangers. When a game starts, players will be given a target - another player - that appears on their cellphone screens as a dot on a virtual map. The game can be played on almost any territory, whether a college campus or a city."But no. It was talking about the real GPS game. Find the GeoCache.