This is thanks to a microsoft.public.sharepoint.portalserver post by Edward Lee. The MS White Paper's intent is to provide a SPS feature comparison between Office 2000, XP, and 2003 and SPS2003. Its valuable for no other reason than a lengthy set of Sharepoint features at the end of the document. Getting me juiced for an upgrade. (Considering the anticipated pain of upgrading, I'll need lots of juice.)
http://www.microsoft.com/office/sharepoint/prodinfo/officeintegration.mspx