Links

General Pages on Japanese
Jim Breen's Japanese Page. Jim Breen is a guru so do yourself a favour and check out his site.
Charles Kelly's Online Japanese Language Study Materials has a brilliant collection of quizzes, from basic Japanese in romaji to kanji compounds found in newspapers. And the man has an awesome beard.
Sabotenweb is just a collection of links.
JapanEd is a commercial site but they have some useful free articles on learning Japanese, downloadable as pdfs.

Japanese Language Proficiency Test
Meguro Language Centre has a site chock full of downloadable goodies from simple flash quizzes and kana drills all the way to 175 page pdfs containing lists of the JLPT Level One grammar, vocab and kanji.
JLPT Grammar A rough draft of a grammar covering the first and second levels of the JLPT.

Audio files
NHK has short language lessons. Good basic listening material.
Japanese Online has a series of dialogs with matching audio files (downloadable as zip files)

Kanji
Kanji Clinic Awesome site. Articles from the Kanji Clinic column appearing every Thursday in The Japan Times.
Kanji Study Guide Based on the Heisig method. Lots of info on each kanji. The kanken schedule is cool.

Online Dictionaries
ALC, publishers of Nihongo Journal, have an online dictionary
Rikai is an amazing online dictionary.
Goo - yet another online dictionary.
Hira Hira no Hiraganamegane slaps furigana on webpages.

Language Learning
The English-Learning and Languages Review: lots of strong words about how languages are learnt, and polemics on current language teaching orthodoxy.

Miscellaneous
So you want to learn Japanese.... Reasons why you shouldn't.
Collin’s Guide to Japanese Self-Study One guy’s advice based on his experience. A little formal, but sound advice.
Hentai dictionary: Japanese perversions, fetishes and AV slang.
Mangajin magazine went bust a few years ago but Wasabi Bros Trading Company are selling back issues

Comments

[Jason]

Here's a link that contains the downloadable NHK audio files in MP3 format.

http://www.hickorytech.net/~nic111/

It's much better than that real audio format.