Contributed By: Cliff Hobbs [MVP SMS]
Reproduced from the myITforum SMS email discussion list (signup here):

"Security Update Inventory Tool component of Microsoft Systems Management Server 2.0 Software Update Services Feature Pack has been updated. This update replaces the previous update (April 11, 2003). It includes MBSA v1.1.1 to support Windows Server 2003. Only Security Update Inventory Tool was updated – other components were not changed."

http://www.microsoft.com/SMServer/downloads/20/featurepacks/suspack/default.asp

Related KB article: http://support.microsoft.com/?id=822643