Yet another example for in-store information service: "You download NM Service from the iTunes app store and opt into service. In-store location sensors are installed at key entry points throughout the store. If the loaded app passes within range, the sensor automatically prompts NM Service to act. Once NM Service is engaged, you will be able to find new arrivals on the floor, and learn about the line, the designer and fabric." - from here.
But we can do that without the special sensors. It is what our SpotEx project about. And InMall application (it is based on SpotEx ideas) targets retail exactly. Feel free to contact us when/if you need a live demo for InMall