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I just wanted to let you know that the MU team has investigated some reports that the KB973869 (MS09-037) update is being re-offered through Automatic Updates and Windows Update on some x64 systems even after it has already been installed, and they identified some limited scenarios where this is occurring with Windows Server 2003 x64, Windows XP x64, and Windows Server 2003 for Itanium-based systems.
For all the details see http://blogs.technet.com/wsus/archive/2009/08/14/re-offer-reports-confirmed-for-kb973869-ms09-037.aspx
J.C. Hornbeck | Manageability Knowledge Engineer