While reading about the latest patch release from Microsoft,  I came across the following article Microsoft Security Update Guide, Second Edition. It covers in high detail, the significance of security updates and provides IT pros with a high level of understanding around the updates process. The article also covers the Risk Management process and highlights useful tools.

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=67c53d51-b3d4-4538-af56-057406a270db&displaylang=en