I just installed software for anti-theft called Prey which licensed under GNU General Public License version 3 so user can use the software and the source code included for modification if needed or just want to check the source code. I've installed for my laptop and my phone, testing have been made to test the function and for now quite reasonable to recommended to use. My friend in UiTM Segamat informs me that one of the student got back the laptop by using Prey. Nice Job Prey.
In their blog have some of the user testimonies.
Want to download here the link: http://preyproject.com/
The image taken from: http://preyproject.com/blog/cat/recoveries