CJK Quick Start
Read and write Chinese, Japanese or Korean in any version of Windows.
http://zsigri.tripod.com/fontboard/cjk/

Japanese-English Dictionary Interface (JEDI)
An interesting feature is the possibility to translate English words in Romanji (that's very usefull if you are a non-Japanese speaker trying to type Japanese word).
http://www.notredame.ac.jp/cgi-bin/jedi-inon

Marshall's Japanese Web Page
Page by Marshall C. Ramsey dedicated to programs and information for Japanese language learning including freeware and shareware Kanji flashcards.
http://ai.bpa.arizona.edu/~mramsey/japanese.html