Stalking People's Wi-Fi One Box At A Time

DIY stalker boxes spy on Wi-Fi users cheaply and with maximum creep value
CreepyDOL follows you around town, vacuums up wireless digital crumbs.

[link to arstechnica.com]

You may not know it, but the smartphone in your pocket is spilling some of your deepest secrets to anyone who takes the time to listen. It knows what time you left the bar last night, the number of times per day you take a cappuccino break, and even the dating website you use. And because the information is leaked in dribs and drabs, no one seems to notice. Until now.