[The public face of Big Brother's Beast Computers.  Google mapping was caught in the UK grabbing data by using wifi, which says it all.  It takes the average computer ages to even find one document, and then only searching file names, yet Google can search billions of documents, and every word in those documents, in a second or nano-second.  And then there is street view!  Awesome.]

See: Wikipedia

[2010 May] Google Street View secretly took your wi-fi details... and will use the data to target ads at mobile phones