In several areas of the open source community, Git is the hot new source code management system. It's been popular now for a while, so it's not just a flash in the pan. It's really worth learning, especially if you're in the Ruby community.
If you're wanting to learn git, here's a great whttp://www.blogger.com/img/blank.gifebsite:
But more than just learning, use the site as inspiration. If you've got something you know how to use, something as simple as source code management, start writing tutorials. Put a site together around it.
Who knows? Maybe you'll be the next website someone else blogs about. :)
btw, I found this link on a reddit post. I want to get involved... Lots of great fodder in here!