My favorite part of TechEd are the hands-on labs. As excellent as same of the classes are, the hands-on labs are the best direct learning experience for me. I did a great lab this morning on User Account Control (UAC). UAC has changed in Vista because of many of the security changes being made. No longer will people be running as Administrator all of the time, leaving themselves very vulnerable to virus attacks. Now when a process needs admin priviledge, it asks permission. This is a good thing because it helps to keep unauthorized processes from running in the background.
I also learned about changes and additions to Group Policy in Vista. The sysadmin will have a lot more granular control over what a user can and cannot do. The best addition is being able to prevent USB thumb drives from working. Many businesses view USB drives as a security risk, so this is a very good idea, much better than putting glue in the computer USB ports. :-)
Overall this was probably my best day at TechEd so far.