Learn more about how to customize context menus and see a sample that updates an existing context menu in Microsoft Word 2010.
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Customizing Context Menus in Office 2010
Introduction to the Office 2010 Backstage View for Developers
Office 2010 (Beta) introduces the Microsoft Office Backstage view, the latest innovation in the Office Fluent User Interface, and a companion feature to the Ribbon. Examine the components that comprise the Backstage and explore scenarios that show you how you can extend the Backstage across various Office applications.
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Introduction to the Office 2010 Backstage View for Developers