Although I am not a Mac ethusiast, I came across a software from a vendor called "Orbicule" that looks quite interesting, something called Undercover; theft recovery software.

Saw this at Slashdot: http://it.slashdot.org/it/06/05/22/1044253.shtml

Their story - in case you are not patient - like me - er... meaning I'm not patient either - well so much for being a writer!

Posted by Hemos on Monday May 22, @07:32AM
from the ironc-actions dept.
Dubpal writes "Apple Macintosh users can now fit their machines with theft protection software that reports back on what a thief is doing with their computer, should it ever be stolen. The software, named "Undercover" allows users to report their Macs as stolen, causing the software to report back with IPs, screenshots and even a picture of the thief and his surroundings. In addition to this, Undercover begins faking hardware faults, displaying messages and even reading them aloud, alerting anyone around that the Mac's been stolen."
From Orbicule's site - located at: http://orbicule.com/undercover/

Because laptops are increasingly popular, and desktops are becoming smaller and more portable, computer theft has reached huge proportions worldwide: there were about 600,000 laptops stolen in the USA in the year 2004. According to a recent FBI report, 97% of all stolen computers are never recovered. Many people we know have had their Macs stolen, often in 'safe' situations. That's why we developed Undercover: a unique theft-recovery application designed from the ground up for Mac OS X.
While commercial, I think it would still be interesting to review. I also don't know how Orbicule is as a vendor either.