For a little while now I've been using Word with the Ribbon collapsed, just to see what it's like. It's a pleasant minimalist interface. I don't know if I'll stick with it; for common commands like Bold this ends up taking more clicks to accomplish the same thing, but I tend to use keyboard shortcuts for those kinds of things anyway. Maybe it will work out. I'm just glad that more customization options are appearing than there were in the pre-beta builds, when I couldn't stand the Ribbon.