The Dictionary of Difficult Words, http://www.lineone.net/dictionaryof/difficultwords/index.html 

Haven't we all browsed the "It Pays to Increase Your Word Power" section in Reader's Digest from time to time? Many of us whose work revolves around words are interested in the unusual, obscure, and polysyllabic. The web Dictionary of Difficult Words is a fun place to shop for great Scrabble words and words to amuse and amaze your friends. Give it a try! 

Note: During the summer, I'll be posting Websites of the Week that are a bit off the law track. If you would like to suggest entertaining, visually interesting, or other fun websites, please email me at cnyberg@u.washington.edu.