One of my biggest worries with the upgrade from MS Office 2003 to Office 2007 is that our users will keep the helpdesk busy with questions about the new user interfaces of Word 2007, Excel 2007 and PowerPoint 2007. The changes are really big. Microsoft now offers a very useful and easy-to-use tool which allows users to find the new locations of commands they know from former Office versions.
So far there are guides for Word 2003 to Word 2007, Excel 2003 to Excel 2007 and PowerPoint 2003 to PowerPoint 2007. They are all flash applications simulating these three Office programs. If you click on a function of Word 2003, for example, the flash tool will run a short animation showing you where you can find this function in Word 2007.