I looked through most of these sites, but very few of them looked very good to me.
I don't know why so many people start writing their own Japanese lessons on the web, and then sort of leave them half-baked.
Of the sites I've seen, the best ones I know of are:
Learn Japanese - Japanese Language (about.com)
kanjiclinic (column from the Japan times about kanji.)
Another good one is:
JP NET Home Page
but you need to search a lot to find the useful material.
My own site, in the signature below, is a frequently asked questions about Japanese. It's not specifically intended as a language-teaching site, but there is some background material there which might be worth looking at. A lot of it sort of assumes that you already know something about the language though, since it's very hard to write a "frequently asked questions" for language beginners.