Office Project Server 2007. Although Office Project Server 2007 is not included with Office SharePoint Server 2007, it is built on the Windows SharePoint Services 3.0 platform and can be deployed to a Windows SharePoint Services 3.0 or Office SharePoint Server 2007 farm.

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Plan for redundancy (Office SharePoint Server):
http://technet.microsoft.com/en-us/library/cc263044.aspx