I just downloaded Ribbon Hero, a free add-in for Office 2007 and 2010 that scores your usage and trains you to use new features through fun challenges. The more advanced features you use, the more points you score.

Once installed, you'll find a new Ribbon Hero buttons at the far right of your Ribbon in Excel, PowerPoint, and Word:

Word Ribbon Hero

Ribbon Hero keeps score whenever you use these programs, but you can click the button to open up challenges and learn more by performing useful tasks, such as formatting text and adjusting margins in Word or freezing rows and using charts in Excel.

Each challenge opens up a sample file for you to work in and offers hints if you need them.

Ribbon Hero challenges

Who knew that playing games at work could be completely justified and even make you more productive?