gWaei is an easy to use and yet powerful dictionary program for Japanese to English translation. It organizes results by relevance, supports regex searches, tabs, spell checking, kanji handwriting recognition and an console interface.
A Screenshot on Windows 7
Clicking Kanji in a main search to look it up.
Easy install of the dictionaries you want.
The waei help flags.
Use Kanjipad to draw kanji that you don't know.
You can also use the Radical Search Tool to research Kanji.