Attach a camera to a drone, fly the drone around the back of the house, locate the bad guys. Robotic UAVs are being used for surveillance by everyone from the military to local law enforcement to emergency personnel. But if you think about it, drones are kind of big and really noisy, not the ideal tool for spying on someone. Their data gathering capabilities are limited too and they’re really expensive. What about a computer, small and durable enough for you to toss over a fence or inconspicuously attach to a car? Equipped with Wi-Fi cracking software or GPS, it could infiltrate someone’s computer or track someone’s location without them knowing.

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http://singularityhub.com/2012/02/03/hold-dropping-the-f-bomb-a-disposable-spy-computer-funded-by-darpa/