from bunnie’s blog

For ETech08, I built the “Chumby Tower” and one of the hacks featured in the tower is a version of the chumby that sniffs wifi and renders captured packets onto the display. The chumby is a great device for passively monitoring wifi signals, because it has a screen for rendering the data real-time, sufficient CPU power to do the data processing, and it’s cheap enough that you don’t mind dedicating it to that application. It’s handy, for example, to see if your neighbors are stealing your wifi link to surf the web; at a glance you can see what URLs are going by over the air.