Ingress?

Anybody else been playing this confusing smurf of a game? I'm absolutely loving it.

If you don't know what it is, it's a geocaching capture the flag game. Two teams compete against each other, using the GPS on their phones (it's only on Android at the moment, in open beta), to find local landmarks ("portals"), capture and defend them (with "resonators").

Whilst you do feel a little silly pacing the streets, standing in front of plaques, murals and statues with your phone beeping away - it's rather addictive once you've created a huge field of green/blue for your team.