I find git to be a joy to use. Been using it in all my projects except the ones I do with Rails. Haven't checked the git integration with Rails lately, but with this move, it should be better.
I think you can use any version control system with any project. I can't understand what prevented you from using Git for your Rails projects (unless you develop rails itself).
You're right I can use any version control system for my project. But rails has this nice automated hooks to subversion, which I don't have to configure myself. I'm hoping that they have now added the same integration for git.