On-line study pages for beginners

Grammar & Vocabulary
Genki Online Flashcards for words and conjugations.
English-Japanese Vocabulary Quizzes Multiple choice questions covering English to Japanese translation, and vice versa.
Genki Exercises Vocabulary quizzes

Reading
Minimini Ehonkan A great collection of Japanese picture books. PDF, HTML, and Flash versions are available.
Minwa Mukashi Banashi no Peeji Folktales from all over the world with pretty GIF animation and background music.
Reading Tutor Dictionary-aided readings and comprehension quizzes. A little bit challenging!

Writing & Kanji
Gakushu anime no yakata Great animation showing how kanji are created.
Gahoh A page which shows the stroke order of Japanese characters.
Japanese Writing Tutor Mirror Site Another page which details the stroke order of Japanese characters.
Japanese Typing Practice Typing with listening practice.
Japan Poem Japan Poem electronic greeting service. You can send e-cards with beautiful ancient Japanese pictures, poems, and sounds.
Java Kanji Flashcards 500 Paper version of kanji flashcards. Good for your vocabulary cards.
Kanji Clinic A variety of articles dealing with kanji learning written in Japan Times.
Kanji game Fun games for kanji practice.
Katakana Study Online Introduction of katakana characters with listening and reading practices.
One Piece Punch De Typing Exciting games for kana typing.

Listening
Japanese-online Dialogues with scripts and grammar notes.
Learn Japanese on the Web Various samples for listening practice.
Lesson/J Dictation for words and sentences.
MANGARAMA Comic strips with audio. You can learn colloquial expressions or slang. QuickTime is required.
Nihongo o manaboo Short dialogues with animation for listening and learning about Japanese school life.

Dictionary
Jim Breen's WWWJDIC Japanese-English Dictionary Server Online dictionary; can translate words, sentences, and entire volumes of text.
Rikai A neat dictionary that shows pronunciations and translates English to Japanese and vice versa, using popup windows for descriptions.