Go get a Nintendo DS, then there are some japanese kanji games like "Kanji no Shou" and then "My Japanese Coach" for a complete grammar/japanese learning suite.
And getting real educational books is also useful. Like the "Genki" volumes.
ah, and for learning vocabulary:
http://iknow.co.jpThis site is both for english and japanese learners, there is lessons to learn english to japanese words, and vice versa.
You'll be learning japanese in no time with a Nintendo DS and a japanese educational book. And that site as a supplement.
Enjoy ;D