Activities for ESL Students

This website contains bilingual quizzes for students who want to review or gain more English vocabulary, coupled with their first language vocabulary, as well as other exercises for ESL learners.

http://a4esl.org/

Busy Teacher

This website contains lots of materials and worksheets in grammar, vocabulary, speaking, reading, listening, writing, and pronunciation.

http://www.busyteacher.org

English for Everyone

This website contains skill building worksheets geared towards a range of English ability levels.  I have found these worksheets useful in improving students' reading comprehension and grammar, especially for NCLB K-12 students.

http://www.englishforeveryone.org

My Language Exchange

I think this is an awesome tool for those who want to communicate with people of other languages online.

http://www.mylanguageexchange.com