I don't know if anyones mentioned
123 Japanese - Learn Japanese for free online
Its a free website. It has vocabulary dictionarys full of pretty much anything....lists of all the mammals, fruits....etc.
It has lessons too, in casual Japanaese and polite Japanese.
What I like most about it, is that it teaches Japanese from very basic stuff, to more advanced, other websites i've found just toss stuff in your face.
