Nike Grid - New Urban Sport
Nike have unveiled a pretty interesting Urban Game to get people running.
Basically they have split London in to a grid and have specific phone boxes within these grids that participants have to run to. Once at the phone they dial in with their unique pin to register their time. The clever part is the integration of social media - updates get posted to Facebook and Twitter and also people can win badges for winning phone boxes.
For a better explanation watch this video: