When Apple announced the addition of a compass to the iPhone 3GS, shortsighted onlookers responded with a yawn. Yay, we can find magnetic north. But iPhone app developers quickly saw an opportunity, and a new breed of "augmented reality" apps are about to be born. Holding the phone in front of you, locations are plotted on a live view of the world in relation to where you're standing. The apps combine the phone's key features -- camera, GPS, compass and Internet connectivity -- to create a sort of head...
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