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Wardriving is the strange (and somewhat unfortunate) name for driving around with an 802.11x wi-fi equipped notebook computer looking for open access points. In a place like Manhattan they are everywhere. If you find one, you might want to engage in a little on the spot documentation with a graffiti language created to tip off fellow searchers: warchalking.
But why limit yourself to just wi-fi? The air is full of all kinds of signals. Check out these do it yourself plans for remotely monitoring wireless video cameras: warspying.