If you are curious about wireless networks and you like to know all the traffic that is on your Mac, I think iStumbler is a mandatory but tremendous one, since it allows you to know practically everything that goes through your Mac.
Air traffic can be monitored as long as it is an AirPort unit that works and not one with a third-party driver, while with Bluetooth we can see the associated devices, with Bonjour the discovered ones, with Location we can know the saved location data and the log will allow us to follow a record of what happened.
To all this we must add that it is a totally free program (they accept donations), a real pass.
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