Kismet on Mac OS X
KrON writes "Kismet, undoubtedly one of the finest wardriving tools around, now has the ability to capture under Mac OS X using the Viha wireless drivers. Not only do we get to play with Kismet's awesome CLI now, but we can also use it in conjunction with GPSDrive"
One OS X application worth mentionning is Kismac. It seems to have similar features and has a cocoa interface. It would be interesting to compare the feature of both applications.
I suppose it could be useful for an administrator trying to sniff out network vulnerabilities. I know of one large company that's become very paranoid about wireless access points after discovering a few unauthorized installations on the company LAN. There wasn't any plot behind it, just a few employees experimenting, but there were holes that could've been exploited nonetheless.
Other than that, I can think of better uses for my time than trying to spy on my neighbor's network traffic.