Over the last few months, Doug, Wouter, Brian and lots of other people delivered a series of OpenXML workshops around the globe. Those who were there, and those who weren't, can now download all content of these workshops from OpenXMLdeveloper.org.
As a side note: I also spotted a good article on OpenXML, explaining the Open Packaging Conventions with a self-created file format (based on OpenXML).
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