Check out new 'casts from IT Showcase on internal Microsoft security:

How Microsoft IT Manages Physical Security through Strategic IT Convergence

Join this session to gain a better understanding of the Microsoft Worldwide Security Operations and how they protect Microsoft assets in a manner consistent with corporate culture. Through the strategic deployment of security systems, the Microsoft Corporate Security group is improving the way it protects Microsoft assets, information, and employees.

and sign up for Feb:

TechNet Webcast: How Microsoft IT Uses Forefront Client Security (Level 200) 

Join this webcast to learn how Microsoft has deployed Microsoft Forefront Client Security on approximately 50,000 machines. In this session, we review Microsoft IT’s experience with Forefront Client Security, and also discuss architectural considerations in deploying Forefront Client Security at Microsoft.