I came across this nifty application called Lockdown based on the popular iAlertU.
It’s a program that locks your screen with a password when activated.
 
But then it tracks:

If the mouse is moved
If a key is pressed
If the PowerSupply is detached
If a USB device is detached
If the Computer is moved (only on real Macs, eee don’t have movement sensors)

So if someone tries to steal your Hackintosh an alarm goes of and it sends the picture of the iSight cam to a personal email address.
So when you’re working in the Library …