News item this evening. Thief steals iMac. Owner writes some code that senses when the thief is using the computer - sends message to owners. Better yet the built in iSight camera is taking shots of the perp every 2 minutes. Police visit and recover the computer. So now you have another reason to buy a Mac instead of one of those other things.
Odd footnote: NZ police haven't arrested anyone or laid charges. Another occasion involving a camera filled with evidence (per Bjork assaulting kiwi photographer - caught on security cam at airport) but doing nothing. Something to think about next time you get a speed camera fine - low hanging fruit policing.