Learn Microsoft Office new User Interface
Microsoft released some nice tools to improve the learning curve in a transition between Office 2003 to office 2007.
The tool is actually a flash application where you first select the action in a Word 2003 environment and then it shows where to find the new command in Word 2007.
You can download them here:
Word 2007 Guide
Excel 2007 Guide
PowerPoint 2007 Guide