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There are already similar applications for movies. You use your cellphone camera to take a picture of the bar code of a movie you see in a shop, it will then use the internet to look up what movie it is and tell your computer to start downloading it from a bittorrent, so you can start watching when you get back home.
It shouldn't be too hard to do the same for books and make it look up the best price and then buy it from the appropriate webshop.
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