Give yourself Wi-Fi ESP with this handy little project that MAKE:Blog has linked to.  With a little work with a micro-controller and PIC you can have a small sensor that provides a heartbeat-like signal that gets faster the better the Wi-Fi signal.
“Thought you might like my latest project — a 6th sense for wireless networks! This project allows one to literally “feel” wireless access points and their signal strength as easily as you feel the wind on your cheek. Note that this power is to be used only for good, unless an evil application can be demonstrated to pay better.”

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