I was just browsing the web at home as I'm use to some evenings of the week, and I stopped at this blog : http://blogs.technet.com/steriley.
This guy speaks about security in a way I could not stop reading his posts !
Really check out this blog, it's really interesting (and I'm not kind in security at all).
Additionally, you can find one of his TechEd intervention dealing with Virtualization and Security :
Slides : http://microsofttech.fr.edgesuite.net/msexp/download/spotlight/991/991_pres.zip
Video : http://microsofttech.fr.edgesuite.net/msexp/download/spotlight/991/991_high.zip