If you noticed that your 2003 clients were not receiving their patches then you should check out this KB http://support.microsoft.com/kb/954474
This affects only 2003 clients attached to a 2007 architecture.
"You use Microsoft System Center Configuration Manager 2007 or Configuration Manager 2007 with Service Pack 1 (SP1) to deploy updates to Microsoft Systems Management Server (SMS) 2003 clients. In this scenario, the Microsoft Windows Server Update Services (WSUS) Offline Scan Catalog cab file (Wsusscn2.cab) may not correctly synchronize with the site server database when you use the Inventory Tool for Microsoft Updates (ITMU). This problem may prevent the June 10, 2008 security updates from being deployed to SMS 2003 clients."
I am sure there are many of your pulling your hair out wondering...what did I do wrong!!!!
