Suggest creating a category structure
I see what you mean (having a hierarchy with OERNZ embedded at every level is redundant) and agree that we need to be careful not to over-prescribe. But with the current less than perfect (IMO) search mechanism we need a way for newbies to provide information about their resource so WE can know it exists.
I think discussion of categorization in general falls squarely in the purview of the style guidelines workgroup. The two proposed guidelines I linked to in my post above suggest a hierarchical scheme (at least to some extent). I've been trying out the ideas in these proposed guidelines and wondered how categories fit with the subpage structure that WE use (it's easy to see the subpage structure when on a low level page, but there's no indication of subpages from the top page unless the author includes the links).
Creating a template for use on the main page, to collect lots of info from users, is a good idea. Maybe our first step should be to collect data. As you suggest, let's see how users "tag" their pages and then we can discuss ways to make the best use of that data.
Let's continue this discussion in the style guidelines workgroup. I'll propose this in response to Wayne's email.