I'm sorry to hear about your loss, and can't provide any help, however, if anyone is reading this forum and might be worried about this happening to your machine, read the following:
howto track a stolen ibook/powerbook
Basically, you setup a crontab to hit a server where you have access to the logs, so when the low life turns it on, and it's on the internet, you can atleast get the IP - though I don't know what legal recourse you'd have.
There's also a
bunch of software that will help you
One that looks pretty neat, and is only $4 for students is
lapcop
It notices if the environment (printers, etc) has changed and sends you an email. They claim that if you send them the email, they'll help you track it. I've never tried any of the above software, I think you can do it all using crontab, but for $4 you can't go wrong.
good luck!