Rated 4 out of 5 stars
This is a great program for learning kanji, you just need to make sure that it is the correct kanji, as many English words have multiple meanings. I've been using it in conjunction with Rikaichan to double check the kanji and confirm that it makes sense in context.
I would like to see the click functions changed around a little. It seems natural that a left click should turn it on/off and a right click should bring up the context menu.