This is an interview (audio only) with Senior Product Manager Gray Knowlton (http://blogs.technet.com/gray_knowlton) about the Office Open XML File Format, so if you’re interested in a primer on what it is and what it’s benefits are, this is a good 15 minute "product-cast".
You can also download the audio files from the Microsoft Download Center at:
http://download.microsoft.com/download/6/6/4/664d29a3-4832-435c-842e-7e424ae1a57b/OpenXML.EXE
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Kurt Shintaku's Blog 