Altavista Babel Translator http://babelfish.altavista.com/ 
ESL Grammar Central
Topics ESL Online Magazine
Interesting Quizzes for ESL Students
Activities for ESL Students 
Flash Quizzes for ESL
ESL teachers will love the resources provided at Lantern Fish.
SelfAccess http://www.selfaccess.com
Peak English
Casa Notes  http://casanotes.4teachers.org/ 
Songs for Teaching Languages http://www.songsforteaching.com/languages.htm (Right-click and choose "Save Target" or "Save Link" to download a copy of the song)
Using PowerPoint for ESL Teaching http://iteslj.org/Techniques/Fisher-PowerPoint.html
Dave's ESL Cafe http://www.eslcafe.com/
English as A Second Language http://www.rong-chang.com/
Activities for ESL http://a4esl.org/
Interesting things for ESL Students http://www.manythings.org/
ESL Partyland http://www.eslpartyland.com/
ESL KidStuff http://www.eslkidstuff.com/
Self-Study Quizzes for ESL Students http://a4esl.org/q/h/
Activities for ESL Students http://a4esl.org/
ESL http://iteslj.org/links/ESL/
Selected Links for ESL & EFL Students http://iteslj.org/ESL.html