FYI next week on Tuesday, June 12th we will begin releasing Windows Server 2003 SP2 through Automatic Updates (AU.)
To ensure more control over when and how SP2 is deployed, users will need to click on the AU “Updates are ready to install” balloon notification, accept the end user license agreement and go through the Welcome screen.  Customers can also use the SP2 blocker tool if they wish to disable delivery via AU completely.
WSUS admins are also required to explicitly accept the SP2 EULA in order to enable automatic deployment.