Office 2010 Developer Map – NEW!

Start visualizing the applications, services, client/server data-access technologies, on-premise servers, platform products and technologies, and tools that help developers build multiple line-of-business solutions.

Read the rest here: 
Office 2010 Developer Map – NEW!

Video: Create Add-ins to Customize the Office 2010 Backstage View

Learn to create a COM add-in that adds a custom tab, group, and other controls to the user interface.

Read more from the original source: 
Video: Create Add-ins to Customize the Office 2010 Backstage View

Sample: Adding Custom Commands and Changing the Visibility of Controls in the Office 2010 Backstage View

Explore the code in this visual how-to article as you learn to create fast command buttons in the new Office 2010 Backstage view and set the format of controls when the Backstage view is displayed.

Read the original here:
Sample: Adding Custom Commands and Changing the Visibility of Controls in the Office 2010 Backstage View

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.

Read the rest here: 
Introduction to the Office 2010 Backstage View for Developers

UI Extensibility in Office 2010

When introducing the Ribbon UI in Office 2007, we also introduced the RibbonX (Ribbon extensibility) model, a new way to programmatically customize the Office UI. RibbonX enables 3 rd party developers and solution providers to build on top of the Ribbon by authoring custom tabs and groups, targeting scenarios unique to and optimized for their customers

See more here:
UI Extensibility in Office 2010