Interesting piece in the FT on using location-based smartphone promotions in physical retail. I haven't heard of any bookshops using location-based services as part of their marketing strategy, but it seems like a natural step.

"In a sign of how the new generation of internet-connected phones is set to transform traditional retailing, [Best Buy] has deployed a location-based marketing tool developed by Shopkick, a California-based start-up . . . Customers who activate the Shopkick application on their phones will automatically receive 'kickbucks' credits just for entering the store that can be traded for benefits."

http://www.ft.com/cms/s/0/e986b328-a320-11df-8cf4-00144feabdc0.html