The new thing from Microsoft is Software Update Services.
"Microsoft Software Update Services (SUS) is designed to greatly simplify the process of keeping Windows-based systems up-to-date with the latest critical updates. SUS enables administratorsto quickly and reliably deploy critical updates to their Windows 2000-based servers as well as desktop computers running Windows 2000 Professional or Windows XP Professional."
Go here for details:
http://www.microsoft.com/windows2000/windowsupdate/sus/default.asp
(please remove any spaces)
hope this helps