Figured I could post some of my natlang-studying resources...
French and Misc Languages:
The entire site is for training some kind of diplomatic/military bunch of people, it's got loads of languages.
This sites got a ton of stuff for Indo-European languages. The creator's second language it French, so it has the most.
About.com is useful, although the layout/ads is/are annoying. I use it quite a bit.
I also use this dictionary a lot. Has French-to-English and English-to-French.
AJATT is amazing, but for some reason is stuck in mobile browsing mode at the moment. This site also links to lots of other stuff.
Is down atm, but this is a great help with kanji, if you can figure it out.
This puts kanji reading above the kanji on whatever webpage you want.
I don't actually use this (hah), but it provides stroke order for the kanji.
This is a nice learning site, but I use it most for the two search bars on the side of the page. It has stroke order for most kanji, and is dead useful.
Rikaichan is a browser gadget that searches for whatever Japanese you mouse over and gives you the word meaning, kanji definition, pronunciation, all that jazz. Also dead useful. Have used it to near-successfully browse Japanese sites while knowing probably 0.00000001% of the language.
Marimo is a bunch of Japanese podcasts between three girls and some guests. Found this through AJATT. Their conversations don't sound forced or dumb or anything, and going with the AJATT method, are really nice background noise if you don't want to play Japanese music all the time.
I admit I have yet to actually utilize this site, but I've gotten linked here several times, so it must be alright.
Has a few tools for kanji/Japanese study.
Just in-general language learning sites.
If you're not on smart.fm, you need to get there, now. USEFUL. IT IS SO USEFUL. Amazing for learning vocabulary, kanji, anything. It's mostly for learning other languages, but it's got things like Erudite English and Capitals of the World, etc.