Practice for the New GSL Word List
(Fill-in the-blank sentences.)The Academic Word List (AWL)
Free Rice Play a vocabulary game and feed the poor at the same time. A really cool site.
The Power of Words A YouTube video
Dictionaries
Longman has an online ESL dictionary. It has a lot of information about idioms and how to use words.
Wordsmyth is not an ESL dictionary, but it has an excellent thesaurus if you are looking for another word for something you want to say.