Dave's ESL CAFE

http://www.eslcafe.com/students/

Bilingual Dictionaries & Tools

Ultralingua: http://www.ultralingua.net
http://ultralingua.com/onlinedictionary/
Altavista Babel Fish and Google Translation (both very rough!):
http://babelfish.altavista.com and http://www.google.com/language_tools

Activities for ESL Students

http://a4esl.org/