Ok well my school uses the products on the following links to secure CPUs, Monitors, and projectors, they are quite easy to install, but the lockdown cables are a bit on the expensive side to wire an entire lab.
http://www.meritline.com/mngek1-anchor-plate-lock.html
http://www.secure-it.com/shop/index.php/cPath/21_22
i hope that helped
-rohith