A revolution is taking place in location-based technology that lets GPS do more for you than route planning. Trapster, an app for iPhones and BlackBerrys, employs crowdsourcing to alert drivers to speed traps. With iNap, you can snooze on a train without worrying that you'll miss your stop, and Shopsavvy lets you scan a bar code at a store and then searches for the product elsewhere at a better price.

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Wired magazine

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