I'm sorry, I didn't see the disclaimer on your site; I started at the recent posts and read through a few of them, but the dialogue and description just reminded me of so many other "teach yourself Japanese" guides written by people with only a surface level understanding of the language and try to regurgitate what they've learned.
That sounds bad. Let me say that I think that teaching is a good way to check one's own understanding (as they say, to teach is to learn twice). However, there is a lot of misinformation out there, and these "guides" are the prime source for a lot of mistakes and bad habits that plague beginners.
The order of your lessons is fine, but the way the individual lessons are structured are a bit jarring. For instance, I wouldn't provide "direct translations" into English, because although it shows that there is a difference in word order, it wrongly gives the impression that you can directly translate Japanese into English this way. It leads to a hobbled understanding of how the language works, and unnatural translations.
You spend almost an entire lesson on particles, but just talk about postpositions. I don't know of anyone that refers to them as such. There are other things I picked up on, including your incomplete description of the particles (particularly "ga," which you describe as something that is "known." This explanation is woefully inadequate). You then briefly threw in a short paragraph about verb conjugation, when that could be several lessons all on its own. In another lesson, you again give a brief list of conjugations, but for an irregular verb and neglect to label it as such.
Dashes. I saw Undrentide left a comment about your use of the dash, and how - and ー are totally different. In lessons 4 and 5, you use the ー liberally. Often in English, people will add "-san" to the end of someone's name, including the dash. In Japanese, there is no dash. Also, when you have "Tanaka" spelling out his name and his company, you put them in; this marks an elongated vowel, and is not used in this way. Even further, you wrote とうきょう as とーうーきーよーう. きょ is actually a single sound in Japanese, and this betrays a misunderstanding of the underlying structure of Japanese sounds.
Of course, I can't fault you for reproducing unnatural dialogue or inaccurate information, and I don't mean to come off as a dick (necessarily), but I have grown cynical and crotchety when I see such bad habits copied and preached.
