http://www.languageguide.org/english/index.jsp - basic English vocabulary with audio sound

http://www.thewclc.ca/edge - great site for listening practice

http://eslcafe.com - Idioms, verbs, pronunciation, slang, quizzes

http://idiomconnection.com - English idioms and quizzes

http://www.englishpage.com - Grammar tutorials, exercises, and interactive answers

http://www.5minuteenglish.com - Free short self-study English lessons

http://www.rong-chang.com - A starting point for ESL learners who want to study English through the Web

http://www.pacificnet.net/~sperling/quiz/ - Grammar, idioms, slang and more

http://eslgold.com - Click on "FOR STUDENTS" tabs and then on the Language Skills link

http://www.cdlponline.org/ - Read excellent articles on many topics, written especially for ESL students

http://www.ego4u.com - Grammar, writing, vocabulary exercises, including business grammar practice