I keep all of my projects on GitHub. These are some of my favourites:
I’m working on a simple game using it too:
Burble is a cool web interface for posting short ‘blurbs’ to a GitHub Pages-based site.
The repository itself is a GitHub Pages site (which needs tidying), but can just be forked, cleared and used as a micro blog.
I extended this a little more to use on my main site (this site) to provide a simple web-based front-end for posting to my main site.