This is Google's contest to introduce pre-university students to the many kinds of contributions that make open source software development possible. It runs from November 21, 2011 to January 16, 2012. We invite students worldwide to produce a variety of open source code, documentation, training materials and user experience research for the organizations participating this year. These tasks include:
Blubbr is a free, website that lets you create and play quiz games from YouTube videos. The site calls these "Trivs". You can play trivs in different categories, from celebs and music to sport and education. These trivs can then be shared with anyone across the internet. You sign in with Twitter or Facebook.
How well would you need to understand a topic in order to be able to explain it through a completely different medium?! That's the underlying principle of John Davitt's Learning Event Generator (http://www.newtools.org/showtxt.php?docid=737), which in this site we see writ large.