As you are no doubt aware, Mark Russinovich and Bryce Cogswell joined Microsoft when MS acquired SysInternals, but I think I must have missed the announcement of the SysInternals site becoming part of TechNet. It’s great that Microsoft is continuing to make these tools freely available. FileMon, RegMon and Process Explorer are just a few of the essential debugging and sleuthing tools available in the arsenal.
The Sysinternals Video Library is still available (though it is a fairly expensive) and the “Tour of the Sysinternals Tools” video is free for download.