Paul, I tend to agree, but I've looked at it so much I've got a handle on how it's laid out, but for newcomers, yes I think it probably is confusing.
It's not a "normal" website as such and I think we may have to pay a price for having a format anybody can access. However we may be able to simplify it by having the automatically generated contents in the body of the main page and doing away with sub-categories. I think we need an instant "This site is about ..." graphic at the top of the main page, but still can't come up with any thing suitable. Tony seems to have a good idea how the categories work, maybe he can advise if this is possible.
I think in a way it's good that the site is evolving slowly and carefully. If we were blitzed with contributions it would be difficult to keep up and I think quality would suffer. What we are doing seems to be working it just needs polishing around the edges and posts like this help immensely, the one great thing about the wiki format is that it's a collection of peoples knowledge, thoughts and opinions.