English Daily - There are a lot of interesting idioms and slang on this site. One of the most popular on the web for learning English.

a4esl.org - For beginning and intermediate level students. Lots of quizzes.

Learn Engish with Pictures - There are audio and video files on this website. Good basic vocabulary.

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Interesting Things for ESL Students (Fun English Study) - There are quizzes, word games, word puzzles, proverbs, slang expressions, vocabulary study, pronunciation practice, listening practice and many other things.

English Tenses with Cartoons - Interesting site with moving pictures.

Starfall - This is designed to help children learn how to read, but some of my adult students really love it. It's very colorful and easy to use.

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