Here are some of the Security offerings from Microsoft this week:
26-Jul-04 9:00 AM (PST)
MSDN Webcast: Essentials of Application Security (Part 3) - Authorization - Level 300

28-Jul-04 11:00 AM (PST)
MSDN Webcast: Security Design in .NET Enterprise Applications - Level 200

30-Jul-04 1:00PM (PST)
MSDN Webcast: Creating a Single Sign-On Enterprise Security Portal - Level 200