Office 2007 Training Videos - Start with Intro to Office 2007. (Use Mozilla FireFox if you can't view the videos in Internet Explorer.)
Excel Training Videos - The videos are for the 2010 version but most of the directions would be the same with the 2007 version that we have on all school computers.

Office 2007 - Getting Started - Demos, help and training from Microsoft

Office 2007 Tutorials (Word, Excel, PowerPoint)   - Start with the Office 2007 Overview.

In Pictures - Directions and tutorials for Word, Excel and PowerPoint.

Microsoft Office Clip Art  - Free clip art and media collections.