Augmented reality in cellphones
There's an interesting New York Times article about the beginnings of augmented reality programs that lay data onto the real world as seen through your cellphone's camera. Thus, you can read about local businesses while looking at them.
http://www.nytimes.com/2009/07/12/business/12proto.html?hpw
http://www.nytimes.com/2009/07/12/business/12proto.html?hpw
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This is going to be a boom area over the next few years. :-)