Not very useful to me. But I use it occasionally as a reference:

http://www.fileflyer.com/view/E5sZ6AF

I can't really tell from just the screenshot (and I haven't followed through to your link), but it doesn't really appear to be all that tightly organised? Vaguely related things are grouped in proximity but there doesn't appear to be thematic groupings divided into different sections. Is there like an index or reference section?

Yes, there is an index. But as I said before, this list isn't very useful. I uploaded it because it may help those who learn things better when they are grouped thematically by topics.

The second item in the な Adjective column might be a typo. It says かな (佳) is a word, but it sounds archaic. You can find it in a large dictionary, but I seldom if ever use it. It's a popular name for girls, though.