Declan's Japanese Dictionary 

Declan's Japanese Dictionary is a fully searchable 20,000 word Japanese-English dictionary. The program includes a feature that allows custom word lists to be exported to Declan's Japanese FlashCards XFL and integration with the windows clipboard.
japanese edict japanese word japanese words japan kana katakana hiragana kanji

jBrowse 

jBrowse is a free Internet Explorer plugin that can insert word definitions and pronunciations into Japanese web pages. Move the mouse over a japanese word and an English definition appears in the toolbar.
japanese dictionary translation browser plugin web language