Previous version of Laptop Cop let you remotely delete (or retrieve) files from a stolen laptop, but the newest feature makes it genuinely worth paying for: Real-time geo-location using just Wi-Fi.

It uses Skyhook, the same Wi-Fi location tech that iPhones are using to triangulate your position against Wi-Fi access points. . Much like Google maps, but a little bit more sophisticated.

At this time, its only for Windows, so don't be stealing windows machines, laptop thieves! Steal mac ones! Just kidding.

[Laptop Cop, Skyhook]