Kotoba – Online Language Learning and Dictionary
http://kotoba.wardosworld.com
Multi-lingual dictionary and study list builder.
Kanji Brain
http://www.kanjibrain.com
This site isn’t for everybody. It’s geared towards intermediate and advanced students. It breaks dictionary terms into fundamental pieces. It also provides contextual examples for most terms. The site encourages a lot of community feedback, so it’s a great opportunity to carve out your perfect resource.
Japanese Vocab Twitter Feed
http://twitter.com/jvocab Follow the Twitter feed to get a new Japanese word every day (9AM PST). The words come from various practical sources and are often not found in textbooks so this is a great way to improve one’s vocabulary!
About: Japanese
http://japanese.about.com Lessons, Dictionaries, Calligraphy, Vocabulary, Culture, Listening and more. “Learn the basics of Japanese grammar and useful expressions. … Learn about naming conventions and the meanings of Japanese names.“