A while back I posted on a quick and dirty helper app I'd written to attach custom XML parts to a Word document and set up the bindings on the content contols in the doc. Well Matt from the Word team happened to read my post and sent me a mail about an app he's written to do the same thing (in a slightly more elegant, robust and comprehensive fashion!). It works *really* well and offers (among other things) drag and drop support for mapping nodes in your custom XML to content controls in your document. No more messing with the XPath yourself... 🙂
The app is available on Microsoft's community development website, CodePlex. You can find it here: http://www.codeplex.com/Wiki/View.aspx?ProjectName=dbe.