Yea for me! I actually contributed something that should be running in lots of Rails apps after the next release (even if no one's using the feature but my previous project).
After a month or so of working with git, and watching the ease with which git and github allow open source projects to take contributions from the field, I'm really excited. I can't imagine my little patch would have made it into Rails so quickly (or at all) if not for the incredible ease with which any developer can bring the patch into their own repo, test it out on whatever branch they like, and commit it wherever they like.
If you haven't already, it's a great time to start contributing!
(If you don't have any features to add or bugs to fix, check out some other people's patches and give them a +1 or -1 based on the instructions on Rails' Lighthouse. Maybe you can start with this one.)