Online Resources           

There are heaps and heaps of online Japanese study sites out there. A quick Google search will find many. The following sites have free materials, and come recommended by ALTs.

General


Sabotenwebfs huge collection of Japanese language sites on the web (some links broken):
http://www.sabotenweb.com/bookmarks/language.html

The Japanese Page
http://www.thejapanesepage.com
Grammar, vocab, JLPT resources, kanji-a-day emails.

Meguro Language Center  

http://mlcjapanese.co.jp/
A great website with lots of free grammar, vocabulary, and JLPT resources.

Grammar/Conversation

Pera Pera Penguin
http://www.yomiuri.co.jp/dy/columns/0002/
Conversation lesson column from the Daily Yomiuri, downloadable for free.

Japanese Online
http://www.japanese-online.com/
Good story-based lessons. Can provide online webcam lessons with a tutor.

Nihongo o Narau
http://www.learn-japanese.info/
Very good overall study sight. Continually being expanded.

Nagoya University Grammar Drills

http://mercury.ecis.nagoya-u.ac.jp/webcmj/

Grammar and expression collection
http://www.jgram.org

Listening

Cornell University Language Center Listening Links
http://lrc.cornell.edu/medialib/ja/yk3

University of Victoria, British Columbia Listening Exercises
http://web.uvic.ca/hrd/japanese/listen/

Stanford University Listening Exercises
http://www.stanford.edu/class/japanese1/listening.htm

Yomiuri News Stream (for Windows Media Player and Real Player)
http://www.yomiuri.co.jp/stream/

Vocabulary

Language Guide
http://www.languageguide.org/nihongo/
Vocabulary resource with voice commentary. Scroll over the words/pictures to hear the correct pronunciation. Also has kana writing practice.

Kantango
http://www.kantango.com
Make your own online word lists, flash cards and written tests.

Kanji, Kana and Reading

Teach yourself Japanese
http://www.sf.airnet.ne.jp/ts/japanese/
A handy site with excellent explanations and sound files to help pronunciation.  Main focus is kana and vocabulary, though also has grammar explanations.

Kanji Site 

http://kanjisite.com/
A great site for studying kanji, especially if you aim to take the JLPT.  Includes level 3 and 4 kanji tests and preparation.

Kanji Step
http://www.kanjistep.com/
Study resources, including tests and sound files.

Kanji a Day

http://www.kanji-a-day.com
Daily kanji, listings, JLPT information, etc. If you register, it will remember your level, and choose appropriate kanji for you.

Online Java Kanji Game

http://www.asahi-net.or.jp/~ik2r-myr/kanji/kanji1a.htm

Rikai.com 

http://www.rikai.com/ 
Interposes itself between your browser and the text, gives you the reading and meaning of kanji when you move your mouse over them.

Aozora Bunko
http://www.aozora.gr.jp
Collection of out-of-copyright Japanese literature.

Dictionaries

Pop Jisyo

http://www.popjisyo.com/WebHint/Portal_e.aspx
A web-based pop-up dictionary: move your mouse over a kanji online and the translation will appear.

The Japanese Slang Jisho

http://www.angelfire.com/anime4/jslang/jibiki.htm
Great site for learning common Japanese slang.

Banbutsu Dai-Jiten Encyclopedia 
http://www.itjp.org/dic/frame.html
Move your mouse over the links on the left for English category names):

Software

Jetset Japan 
http://www.jetsetjapan.com/infozone-lang-downl.shtml
http://www.jetsetjapan.com/infozone-comput-down.shtml
A website for JETs, the first page features downloadable language study software, including kana and kanji programs.  The second page includes software downloads that enable your computer to read and type Japanese fonts.