Contemporary English Usage Guide -- With a detailed look at grammar, style, diction, word formation, gender, social groups and scientific forms, this site is ideal for students, writers, academicians and anybody concerned about proper writing style.
Daily Grammar --: Site sends you e-mail messages with a grammar lesson five days of the week and a quiz on the sixth day. You can look at all the lessons in an archive section.
yourDictionary.com
(Links to over 1500 dictionaries in 230 languages as well as guides on thesauri,
grammar and much more. http://www.refdesk.com The single best source for facts
on the Net.)
Lexical FreeNet --:
Site allows the user to search for relationships between words, concepts, and
people. It is a combination thesaurus, rhyming dictionary, pun generator, and
concept navigator.
Multiple Dictionary Definitions --
This site provides an uncluttered interface and easy access to multiple dictionary
definitions.
The Word Detective
-- Site is the online version of The Word Detective, a newspaper column answering
readers' questions about words and language.
American Rhetoric The Power of Oratory in the United States
askoxford Commonly Confused Words
askoxford Free online dictionary resources from Oxford University Press
bartleby.com Great Books Online -- Encyclopedia, Dictionary, Thesaurus and hundreds more
Merriam-Webster Online - New Words
Quotations and Proverbs Search Fagan Finder
The American Heritage Book of English Usage. 1996
The American Heritage Dictionary of the English Language, Fourth Edition. 2000