Just an FYI that I posted a note about SQL Server 2005 SP3 on our new ConfigurationMgr blog:
http://blogs.technet.com/configurationmgr/archive/2009/01/06/sql-server-2005-sp3-is-now-supported-for-sms-2003-and-configmgr-2007.aspx
Enjoy!
J.C. Hornbeck | Manageability Knowledge Engineer