On Anime-Manga site you can play games that will teach you the sort of Japanese that is used in anime and manga.
This is a good way to learn different levels of politeness.
There are also interactive word quizzes (with audio in Japanese) and Kanji word games.
The main categories are Samurai, Love, School and Ninja and, in the manga scenes section, there are cultural notes to do with the various types of characters and the situations in which they find themselves.
This site is managed by The Japan Foundation which has many websites in various languages around the world.
