Server Core "Theoretically" reduces the number of Security Bulletins
Just after publishing our video on Server Core, I visited Jeff Jones Security Blog, and found this post
http://blogs.technet.com/security/archive/2008/06/12/download-server-core-potential-security-benefit.aspx
on how having a server OS being installed in a "Core" installation mode, would have reduced security vulnerabilities for Windows Server 2003, if the option was available.

At the blog post there is a report you can read which goes through various benefits from a security point of view for installing Windows Server Core.
Matthew Hardman is the Platform Strategy Manager for Microsoft Singapore. In his role, Matthew works on helping customers get the best value out of their investment in the Microsoft platform.