TextGlow is a Silverlight viewer for Open XML word processing documents developed by Intergen, a Microsoft Partner. Last Monday, Gray Knowltonposted about the availability of the source code for the TextGlow Silverlight viewer on OpenXmlDeveloper.org. You could use this code to put together a web site that provides previews of Open XML word processing documents. I’m not familiar with the extent of fidelity that the TextGlow viewer provides, but it looks pretty good. This code is released under the Microsoft Public License (MsPL), which give you the most flexibility in how you use it.