There is a time for all good things to come to an end, and the time has come to shut down OpenXmlDeveloper.org.
Screen-casts and blog posts: Content on OpenXmlDeveloper.org will be moving to EricWhite.com.
Forums: We are moving the forums to EricWhite.com and StackOverflow.com. Please do not post in the forums on OpenXmlDeveloper.org. Instead, please post in the forums at EricWhite.com or at StackOverflow.com.
Please see this blog post for more information about my plans moving forward. Cheers, Eric
Ecma International has published a whitepaper that explains the basics of Office Open XML as well as some of the thinking behind the format. It's a great overview for those who are new to the Open XML file formats.
Brian Jones's blog has some additional information, and you can download the whitepaper here:http://www.ecma-international.org/news/TC45_current_work/OpenXML%20White%20Paper.pdf