HEX3

http://hex3.co/products/apptag

http://www.engadget.com/2012/09/12/hex3-apptag-laser-blaster-augmented-reality-laser-tag/

Looks neat.  I particularly like this bit of marketting.

The free AppTag Apps keep score via WiFi and players can pick up Augmented Reality Weapons, ammo packs, health Kits, and body armour in a similar way to a console game like Halo™, but this is real life, inside or outdoors!