Leave the WiFi on, Lose the Laptop
I guess you could lose an iPhone or Touch the same way - cheap wifi finders can be used to track down an active device - PCWorld reports:
A statement by the mobile security software vendor highlighted a recent warning from a security specialist at University of Technology, in Jamaica. He said that it appeared crooks running a lottery scam on the island were using stolen laptops to do so. They tracked down the often out-of-sight computers using Wi-Fi radio detectors.
And the cost for such trackers is $50 or less, so it's not like there's a high bar to entry. Sobering...