Shopkick

Another good example of bridging retail and mobile underway:

Shopkick bridges the mobile and retail worlds.
We are funded by Kleiner Perkins's "iFund" and are the makers of CauseWorld, the fastest growing location-based mobile retail app. In the summer of 2010, we will launch shopkick, a mobile application that turns offline stores into interactive worlds, dramatically improving your shopping experience, with a range of partners, including Best Buy and Macy's. ... '