So here's a combination shell script/launch daemon/AppleScript that, if computer is stolen, puts a sticky growl notification on the screen (every two seconds...repeatedly...filling the entire screen eventually) with your name and phone number, offering a cash reward if computer is stolen.

First here's the AppleScript, which I have saved under /etc/.stolen/StolenGrowlNotifier.scpt:

So my laptop was stolen on September 23rd (A 2.26GHz 13" MacBook Pro, 4GBs RAM, 500GB 7200rpm HD...my baby) and it had my entire life on it. It was in the process of making a full backup and while I was at work someone broke into my apartment and stole it. It's probably gone forever along with most of my precious photos, documents and other data, and I'm kicking myself for not coming up with some way to track it. So I made a way. Hindsight is 20/20. *sigh*