Rikai.com
An extremely useful resource for the intermediate reader that uses dHTML to provide English glosses for Japanese texts the user provides
http://www.rikai.com/cgi-bin/HomePage.pl?Language=En
Genki Flash Cards
from genki.japantimes.co.jp
quizzes for hiragana, katakana, and basic vocabulary
http://genki.japantimes.co.jp/self/self.en.html
Japanese I
Introductory Japanese course from the MIT OpenCourseware website. This course focuses on helping students develop their speaking and listening abilities as well as teaching them basic reading and writing skills.
Japanese Online
free online language lessons
from Pacific Software company
http://www.japanese-online.com/
Reference
Jim Breen’s Japanese-English Dictionary Server
One of the most full-featured kanji resources on the web.
http://www.csse.monash.edu.au/∼jwb/cgi-bin/wwwjdic.cgi?1C
http://digicoll.library.wisc.edu/PAIR/
Keiko Schneider’s Bookmarks
extensive collection of annotated and up-to-date links on Japanese language learning & teaching, Japanese news, media & culture.
http://www.sabotenweb.com/bookmarks/
Media
Explore Japan
from the Japanese National Tourist Organization
http://www.jnto.go.jp/eng/