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I know that there are other mobile device "sensory" apps out there such as spiPhone and SoundMiner that make use of your phone microphone to gather info, such as credit card numbers, but this is first that I have seen that would make good use of your camera.
PlaceRaider, a proof of concept app developed by the Naval Surface Warfare Center and University of Indiana, takes a stream of images using the camera in your smartphone, then sends the images to a server where they are used to construct a 3D model of your room(s).   The idea is that this app would be surreptitiously loaded onto your smartphone and run in the background, snapping pics or your surroundings. Scary-cool.  From now on I am showering without my phone.
You can download the PlaceRaider paper here:
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