Try these links to websites that offer valuable, web-based language tools:
www.thesaurus.comwww.dictionary.com
Merriam-Webster OnlineOnline English language thesauri and dictionaries - including more links and daily word puzzles.
Bartleby.comComprehensive language and literature reference.
Guru netOnline reference software with free trial.
Spicyquotes.comDatabase of quotes.
Washington State University, Dept. of EnglishGreat list of errors and non-errors in English.
whatis.comAn excellent dictionary of technical terms.
The Word SpyWebsite dedicated to "the sleuthing of new words and phrases".