Writing is one of my hobbies/passions outside of coding, and using svn/hg/git/etc is so great, since it's all text (or should be, screw word and other word processors that save in binary formats). Being able to track changes and easily get back stuff if you change your mind is wonderful, just like it is in coding.

That's a great idea! I've never really thought about that. Recently I've erased a whole chapter that I was feel was no longer relevant and, in hindsight, I think it's a bummer that now it's lost.