I recently found a page at TechPatterns that makes installing proprietary Video Card drivers when using the Debian Sid (unstable) distribution quite easy and automated.
The sgfxi script provides a simple and (in my case anyway) reliable means to swap between your open video drivers, and the proprietary Nvidia or ATI drivers. Please note that this script is for Debian Sid and not Ubuntu
I also noticed that my computer ran about 10 degree’s cooler once I had installed the driver. So if anyone is having over heating problems, ensuring that you are using your video card’s processor could be your answer. If you do have overheating issues, a possible cause/solution is also mentioned in my ASUS A8JS Hardware Review post.
The above was tested on an ASUS A8JS Laptop running Debian Sid (2.6.23-1-686 kernel).