In a previous post (http://blogs.msdn.com/microsoft_press/archive/2009/04/01/advanced-2007-office-system-user-a-contest-for-you.aspx), I mentioned a series of articles available for Advanced Office System Users. Author of Advanced Microsoft Office Documents 2007 Edition Inside Out, and Microsoft Office MVP, Stephanie Krieger has a series of articles based on her popular book now available with video screencast demos.
The screencast demos one or more tasks from each article, along with some extra tips in some cases – and each screencast is available directly from the article, immediately after the first heading. Here are the links to the articles with screencasts:
And on Microsoft Office Online, the second Office Open XML course