Here's a few more:
Forthrights Phrontistery
http://phrontistery.50megs.com/
phrontistery FRON-tis-te-ri, n a thinking-place [Gr phrontisterion from phrontistes a thinker, from phroneein to think; applied by Aristophanes to the school of Socrates]
Welcome to the Phrontistery! I'm your host, Forthright. Since 1996, I have compiled word lists on various topics in order to spread the joy of the English language. If you're looking for an online dictionary, a word list on a given topic, or the definitions to rare and unusual words, the Phrontistery is for you. Here, you will find my 15,500-word dictionary of obscure and rare words, the International House of Logorrhea, as well as many glossaries, word lists, and other English language and etymology resources.
Luciferous Logolepsy
http://www.kokogiak.com/logolepsy/
Welcome to Luciferous Logolepsy, a collection of over 9,000 obscure english words. Though the definition of an "english" word might seem to be straightforward, it is not. There exist so many adopted, derivative, archaic or abandoned words in what we loosely define as the "English Language", that a clear-cut definition seems impossible. For the purposes of this project though, words are included that may stretch any basic definitions. Particular attention has been paid to archaic words, as they tend to be more evocative - as if their very age lends additional meaning or overtones. Current personal favorites include "skirr", "epicaricacy" and "schizothemia".
pseudodictionary
http://www.pseudodictionary.com/index.php
hello, and welcome to pseudodictionary, the place where words you've made up can become part of an actual online dictionary! slang, webspeak, colloquialisms...you name it, if you know a word that should be in the dictionary but isn't, submit it and we'll post it on this site (with credit given to you of course).
you can submit as many words you like, just keep in mind that only words which don't break any of the guidelines will be added to the site. basically, just make sure the words you submit aren't drug related, overly sexual, describing genitals or body functions, and aren't racist or hateful. we want to keep the site lighthearted and fun for everyone, so words like those won't be added.
Word Spy
http://www.wordspy.com/index.asp
Welcome to Word Spy! This Web site is devoted to lexpionage, the sleuthing of new words and phrases. These aren't "stunt words" or "sniglets," but new terms that have appeared multiple times in newspapers, magazines, books, Web sites, and other recorded sources.