Goldrun allows you to track down, interact with and collect virtual objects placed all around your city and share them with your friends on Facebook. The more stuff you grab the more rewards you earn, so start running!
Only runs in NEW YORK and LA though I think. They are planning on opening it up for the UK audience though so I am told.
Additionally...
AR Mobile startup GoldRun, which recently partnered with H&M on a virtual window shopping experience, was back on the scene to launch an Invisible Pop Up Store for Airwalk with Young & Rubicam's Branded Content Division. This past weekend, kicks fans went in search of limited edition Jim Plastic and Jim Tennis Airwalks using the GoldRun app. With the app, they could capture virtual versions of the sneakers that were GPS-linked to locations in New York and Venice Beach, California. Those who snagged the shoes received an exclusive code that allowed them to purchase one of the only 300 pairs made for the Airwalk line. (http://creativity-online.com/work/airwalk-invisible-popup-store/21796)
