Since Apple has enabled the testing of iCloud they have also added the support for Find My Mac to registered OS X developers. Just like Find My iPhone, Find My Mac allows users to locate their Macs from any web browser or iOS device. When found, you can choose to play a sound or send a message on the Mac; you can also remote lock or remote wipe the Mac. Just remember that if you remote lock and wipe your Mac you will be unable to locate the Mac again at a later time.
The Find My Mac feature will be free. All you’ll need to use it will be OS X Lion and a free iCloud membership. iCloud is expected to debut this fall.