Easy Japanese - Kanji flashcards, quizzes and games help you learn the Japanese language while having fun
Kids Web Japan - in addition to language lessons, this site includes information about Japan's geography, history, Imperial Family, and more -- even a cookbook with recipes you can try at home
Japanese Writing Tutor - practice your hiragana, katakana and kanji (site includes animation of character stroke order)
YamasaInstitute Online Kanji Dictionary – in addition to the meaning, Kanji characters are displayed in 3 images: a print form (e.g. used in newspapers), an animation form (showing character stroke order), and a handwriting sample
Learn Japanese – includes grammar, vocabulary, expressions, even a Japanese translation of Rudolph the Red-Nosed Reindeer
The Kanji SITE – more kanji practice; can help prepare you for the Japanese Language Proficiency Test
Japanese Learning Site- provides a variety of learning tools including kanji and vocabulary lists, reading/listening practices, and quizzes
Babel Fish Translation – enter text to translate English to/from Japanese (and many other languages)