'Find My Mac' is the service that is very similar to 'Find My iPhone' with the only difference that since Mac has no GPS functionality, this service will rely on nearby wi-fi network.
This feature has gone live for developers beta testing Apple's iCloud service.
Once it finds the lost Mac, users can:

• send a message
• remotely lock the screen
• wipe out the entire drive

If you are already using it, do write a review in the following space in replies.