We have recently completed posting a collection of videos from our Office Binary File Format Plugfest Event on our MSDN Channel 9 blog. There are six presentations from the event that we posted and one presentation from a SharePoint event we hosted back in June.  In addition to SharePoint and File Format topics, there are also many presentations coveraging Windows and Exchange Interoperability. We are are always looking for feedback, so if there is an Open Specification Topic you would like to see a presentation on or learn more about, just let us know!