I get occasional questions from people wondering how to learn the new Office 2007 interface. Of course, a good book helps (like Special Edition Using Microsoft Office 2007′>Special Edition Using Office 2007 and Special Edition Using Microsoft Office Home and Student 2007′>Special Edition Using Microsoft Office Home and Student 2007). But if you prefer a more kinetic approach, you can try one of the Flash-based interactive tutorials at the Microsoft Office Online site.
Here, for example, is a snippet from the Excel version. Move your mouse over the simulated Office 2003 screen and point to a command for a quick pop-up pointer:
Then click for an animated display that shows you the procedure in detail:
You can find the help tools for Word, Excel, PowerPoint, and Outlook by clicking the blue Help arrow (in Outlook, click Help, Microsoft Office Outlook Help). Search for interactive command reference and click the first link in the search results.
If you’d prefer to go straight to the pages on the web, use these links:
Word 2007 Interactive Command Reference
Excel 2007 Interactive Command Reference
Ed Bott (@ wordpress.com) 
Surely the easiest way of all… is to simply download the Live labs search tab. Anything you’ve used previously in Office but can’t locate on the ribbon – just type it in and youve found it.
It would have been a brilliant addition to Office itself.
Are they wondering how to learn it because they think they can’t change it?
Mark, no, not at all. They know the menus and certain tasks from Office 2003, and they don’t have an intellectual framework to understand how to navigate in the new interface.
For the most part, people simply don’t customize Office. The percentage of people who create or customize toolbars is staggeringly low, in the 2% range.
I find the easiest way to transition my clients is to install RibbonCustomizer and set its “Classic UI” tab as the first Ribbon tab. This way they have both the new and old interfaces. They do not have to waste productive time when using Excel/PowerPoint/Word 2007 apps because they don’t know where the Redmond crew moved stuff..