Mercurial For Documents (on Mac)
Apple's iWork apps work bloody nicely, but they have a vicious flaw in the '06 version -- they delete stuff inside the archive, such as .svn directories. This sucks, really badly, and means that if you use Keynote or Pages, and are paranoid about versioning (like a lot of folks) things, and like svn, you have gnashed for a while.
Anyway, I switched to using Mercurial for these docs. The main reason I like it for my docs directory is that it has a built-in concept of adding and removing things as needed. You can have a simple script like:
cd ~/Documents /opt/local/bin/hg remove --after /opt/local/bin/hg add /opt/local/bin/hg commit -m "Commit docs from WorkFlow Script Thing"
Which does the ~right thing with regard to these broken archive things. I haven't haven't figured out the right way to do Pages and Keynote plugins/wrappers/magic to automatically do revisions on saving docs, when those docs are in the right directory, yet, but it is coming :-)