Doragana DS game
This is an educational DS game that teaches you hiragana/katakana, the first 80 kanji (JLPT N5 level), and about 350 basic vocabulary through activities such as tracing the outlines of the character. There are also a variety of fun word games included, meaning you can learn Japanese without pain.
The game has been created for Japanese children up to the 1st grade, so all the letters on the screen and the things Doraemon says are only in Japanese - but he's always very encouraging!
A great way to learn and become confident in basic Japanese.