This looks pretty cool: Adeona, which is a free and open source security software for tracking a laptop. Follow the link for the full explanation of the software, but besides the fact that the price is very right, this is my favorite feature: “The Mac OS X version also has an option to capture pictures of the laptop user or thief using the built-in iSight camera and the freeware tool isightcapture.” So you can take a picture of the thief. That is almost cool enough for me to see if I can get a laptop stolen and then track the bad guy.
Almost.
Like I said, I haven’t tried this yet and it does look like it might be a half-step beyond the abilities of some basic users, but it looks very promising.