Cool Stuff/Wi Fi

Software
Wifi Scanner: a tool that has been designed to discover wireless nodes (i.e access point and wireless clients)

Etherwatch: monitors your Ethernet traffic, looking for images, and Google search terms

iftop: display bandwidth usage on an interface

Air Snort: a wireless LAN (WLAN) tool which recovers WEP encryption keys

WEPCrack: an open source tool for breaking 802.11 WEP secret keys

Net Stumbler: (aka Network Stumbler) a tool for Windows that allows you to detect Wireless Local Area Networks (WLANs) using 802.11b, 802.11a and 802.11g

Kismet: an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system

Driftnet: listens to network traffic and picks out images from TCP streams it observes

Ether PEG: a free program for the Macintosh that shows you all the JPEGs (and GIFs) going by on your network

Resources
The Tao of Mac - Wardriving

Wardrive.net: Wireless LAN Security (802.11), Wardriving & Warchalking

[[Wi GLE].net]: "Wireless Geographic Logging Engine", worldwide database and mapping of 1,748,723 wireless networks