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Merriam-Webster Online Comprehensive online dictionary and thesaurus, with audio pronunciations.
Oxford Concise English Dictionary Online dictionary with over 240,000 words and phrases, along with tips on usage.
Merriam-Webster Learner's Dictionary Online dictionary aimed at English language learners. Includes pronunciation exercises and a list of "3000 words you need to know."
LanguageGuide.org English Vocabulary Visual vocabulary lessons with audio pronunciations.
Vocabulary lists and resources from EnglishClub.com.
Vocabulary lists and exercises from Randall's ESL Cyber Listening Lab.