Wardriving (well, classroom warsitting) in NYC.
I actually had to look this up..
Wardriving is an activity consisting of driving around with a laptop or a PDA in one's vehicle, detecting Wi-Fi wireless networks. It is also known (as of 2002) as WiLDing (Wireless Lan Driving), originating in the USA with the Bay Area Wireless Users Group (BAWUG). It is similar to using a scanner for radio. Most wardrivers will use GPS devices to find the exact location of the network found and log it on a website. For better range, antennas are built or bought, and vary from omnidirectional to fully directional. Software for wardriving is freely available on the internet, notably, NetStumbler (
http://www.netstumbler.com) for Windows, MacStumbler (
http://www.macstumbler.com) for Macintosh, and Kismet (
http://www.kismetwireless.net) for Linux.