Richard Warren's session titled "Leveraging your Active Directory for Perimeter Defence" is available for free viewing - just follow the link.
The session was described as follows:
"This session highlights the advantages of using Internet Security and Acceleration (ISA) Server 2004 Active Directory for web proxy scenarios. Using AD for network security provides another layer of protection against internal clients transmitting sensitive data and intellectual property to external sources"
The IT's Showtime website hosts a huge range of webcasts all of which were recorded at top rated infrastructure events including TechEd and IT Forum.