For those interested out there, here is an image of the mindmap that shows how this roughly breaks down for the site as it is now. This example show what each language has as far as categories, so there is one of these for ech language on the site. Thus far, that includes Arabic, Cantonese, English, French, German, Hindi, Italian, Japanese, Mandarin Chinese, Portuguese, Russian and Spanish.
Below is the image - click it to enlarge.
I hope this helps everyone understand better the thinking behind the category structure on the site. It is definitely not perfect, and the community is always open to suggestions.