Just an FYI that we have a new post that explains how client approval works when a Mixed Mode Configuration Manager 2007 site is configured to automatically approve clients in trusted domains and to offer insight into how to troubleshoot scenarios where this is not working as expected:http://blogs.technet.com/configurationmgr/archive/2010/01/20/how-it-works-automatic-client-approval-in-configuration-manager-2007.aspxJ.C. Hornbeck | Microsoft