No matter how good of a job we did organizing features in the new UI, there's always the chance that you might run into a feature you're having trouble finding for the first time in the new UI.
To help with exactly this scenario, we created a few security blankets. One of the coolest ones is a tool we're calling the "Interactive Command Reference Guide."
This tool is an interactive mockup of the UI for Word 2003, Excel 2003, and PowerPoint 2003 that runs in your web browser. You can click on the location of any feature in the Office 2003 menus or default toolbars and the tool will show you exactly how to get to it in Office 2007. You can also hover over the commands to see the Office 2007 location in a tooltip.
The below links will only work if you have already installed Office 2007 Beta 2, and there are still a few bugs in the tool... but try it out and tell us what you think!
Word 2003 to 2007 Interactive Command Reference Guide
Excel 2003 to 2007 Interactive Command Reference Guide
PowerPoint 2003 to 2007 Interactive Command Reference Guide