Prey actually does it as part of their reports on stolen laptops: http://preyproject.com/

Probably not with PhotoBooth though :)

that's what I was thinking. make it send the pics to a web archive whenever it finds an open connection. then you'd almost want your laptop to get stolen

But wouldn't a slightly smart thief be able to beat it by using a small sticker on the webcam?

I know a smart lady who (after reading about webcams on compromised machines being used to take snaps without the knowledge of unsuspecting users) used a simple fix; stick a bindi(http://commons.wikimedia.org/wiki/File:Bindi.jpg) on the webcam.

I just recently submitted an app called iTried to the Mac app store which was kinda built for this (http://bit.ly/hEDJTw)

iTried listens for screensaver stopped events, and then takes the picture. I disabled tweetpic'ing the picture when submitting to the app store, but will re-enable in an update.

Before reading the article I thought it was going to be about catching thieves.