Another new article on MSDN about VSTO 2005--this time by J. Jason De Lorme.  Jason mentions that VSTO 2005 doesn't support complex databinding against XMLNodes.  We did add an "UpdateXML" method (renamed to LoadXML in Beta 2) on an XMLNode that should make some of the tasks you do with XML in Word easier--I wonder if this would have helped Jason at all for his scenario.