Brian Jones explains at his blog how users can easily transform Word XML into HTML code:
I've already mentioned that we have a tool available that transforms from Word 2003 XML into HTML. You can download it here.More info over here.
This is actually a pretty cool tool. There are a number of ways you can extend it. By default it will add a behavior to IE so that any XML file that has the Word PI (processing instruction) will automatically have an XSLT applied that converts it into HTML that can then be rendered by the browser. It also does work to store the embedded images to a temp location so they can be referenced by the resulting HTML..