Interesting story out of Australia.
An owner of a stolen laptop posted it on Ebay (in advance of the thieves) asking people not to purchase a Powerbook with Apple serial number W8506001SQ5.
Computer savvy, the owner also got the home IP & modem address of the thieves when they connected the stolen computer to the internet using their home wireless connection.
It’s not a good idea to steal something which has a tracking device built-in … unless you know what you are doing.