Dictionaries
Infoplease.com, Dictionary - http://dictionary.infoplease.com/
An unabridged dictionary from aalii to zymurgy, including a pronunciation guide.
Oxford Dictionaries - http://www.oxforddictionaries.com/
Free online English dictionary from Oxford, plus thesaurus, word of the day, resume examples, letter writing, and English grammar.
YourDictionary - http://www.yourdictionary.com/
A free online dictionary that offers definition search from Webster's dictionary for word meanings and thesaurus.