I have seen a few pots on some of the Management Community blogs regarding SCOM 2007 supporting Windows Server 2003 SP2 and SQL Server 2005 SP2. Both are supported and I can confirm through my own testing that it installs and runs successfully at this
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Read the complete post at http://blogs.technet.com/mgoedtel/archive/2007/04/06/opsmgr-2007-installation-notes.aspx