Hey, no fair! You picked up tips that it took me years living in Japan to figure out!

As for WWWJDic vs. Kenkyusha, JDic has the extremely redeeming feature that it's online, and it's meant to be read from either Japanese and English. However, dictionary entries tend to be rather telegrammatic and don't give a great sense of how a word is really used in context. Kenkyusha is a much better dictionary, but it's written for the Japanese market, and unfortunately it assumes a high level of Japanese proficiency to be able to use it.