Apps with 'Wardriving' feature
WiGLE (or Wireless Geographic Logging Engine) is a website for collecting information about the different wireless hotspots around the world.
WiFiFoFum is a great mobile WiFi scanner and wardriving tool that scans for 802.
G-MoN is a Wardriving scanner to collect and map all received wifi access points. It is also a 2G/3G netmonitor and field test drive tool for radio planning engineers.