The kanjidic2 dictionary has 2500 "most frequent" kanji but because 400+ are not in the Joyo list of Japanese kanji, I have built a web applet to display them.
The applet uses the Curl plugin from Tokyo's Sumisho or SCSK Corp.
The web page is at http://www.aule-browser.com/kanji/kanjidic2-non-joyo.html and looks like this:
The Curl page is wrapped in plain HTML, so no scripts or other nuisance to worry about.