I'm just wondering if anyone knows of an app I could install on my macbook pro that would allow me to photograph someone who has stolen it and receive their photo when they connect to the internet. I realise there would be difficulties with this (a solution with a centrally based server would probably be necessary to do this best) but I'd be very interested to know if something like this exists. My searches have not found exactly what I'm after (eg iAlertU).
or the MobileMe service with Back to My Mac can be used to accomplish what you want. http://www.apple.com/mobileme/features/mac.html
I've been using VUWER which is an open source recovery tool written in applescript.
It can give you screenshots, isight images and IP address info either using Google’s free email and web services or using a remote computer account with scp.
If you follow the additional 'securing your computer' steps you will have a pretty secure Mac with a remote recovery option if the theif connects to the internet.