Apple’s find my iPhone is a useful applications if you lose your
phone or its gets stolen, now Apple are releasing a version for the Mac
called Find My Mac, which will let you track the location of your Mac if
it has been lost or stolen.
Unlike the iPhone version which uses GPS, Find My Mac will rely on
nearby WiFi networks to tell you the location of your Mac, and once
located you will be able to send a message to the Mac , or remotely lock
the screen or even wipe the hard drive.
There are a number of services like this already available from third
party developers, Find My mac will be available when Apple launches
iCloud in September, and the beta version has been released to
developers for testing.
Source Mac Rumors