There seems to have been a surprising amount of attention paid to passive wifi tracking recently. We did a hack weekend project on this last year (http://matthe

There seems to have been a surprising amount of attention paid to passive wifi tracking recently. We did a hack weekend project on this last year (http://matthewmacleod.co.uk/blog/passive-wifi-tracking.html http://matthewmacleod.co.uk/blog/passive-wifi-tracking.html – though I never got to write it up properly) and I've had a number of people looking for more details. This article's a pretty good approach. We used Kismet instead though – you can control it using a nice TCP interface, and have it spit out the hardware MAC addresses of any packets it sees. Pretty interesting, but I'd never roll this out in a public place. Just seems a little creepy…