Information Architecture - How much to teach?

Because we are nice chaps, authors in our intranet CMS can create their own "subsite" menus. My problem with this is that they often make a cack-handed job of labelling and grouping. I've written an IA introduction in the CMS how-to guide, but I'm convinced that few - if any - actually read it. How do I get some basic IA knowledge into their heads, and how much do I give them?