Google streetview + Kismet
dr
Haven't found a second article to confirm, but:

<a href="http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&layout=1&eotf=1&u=http%3A%2F%2Fbandaancha.eu%2Farticulo%2F7231%2Fgoogle-explica-hacen-wardriving-coches-street-view&sl=auto&tl=en">it looks like Google may be using Kismet</a> to do wifi mapping in their streetview cars.