A <img src=/S/free.gif border=0 alt=free width=30 height=15> addin from Microsoft - Download details: Excel 2007 Add-in: Get Started Tab for Excel 2007.

From the Overview section of the download page:

"This add-in adds a Get Started tab to the Excel 2007 Ribbon. Commands on this tab give you easy access to free content on Office Online, such as training courses, video demos, and other Office Online content designed to help you learn Excel 2007 quickly. An Office Online interactive command mapping tool, also available on the Get Started tab, shows you where to find Excel 2003 buttons and commands in Excel 2007. Office Online Community discussions are also available directly from Excel with this add-in."