Almost every educational thread on this forum seems to be dead.
I wonder where all the teachers have gone.

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Lots of activities for ESL students
http://a4esl.org/

A webpage with online courses in English, French, Spanish and Italian.
I used this website very often when I was studying French, it's really helpful.
http://www.parlo.com/

And one for EFL teachers
http://www.onestopenglish.com/

Grammar, vocabulary,listening, reading and spelling activities & quizzes.
http://www.manythings.org/

Especially the audio section seems quite useful.
http://www.manythings.org/listen/

Games, crossword puzzles and reading activities.
http://www.eslactivities.com/

Modern English Teacher
http://www.onlinemet.com/

ESL Lounge - lesson materials, lesson plans, worksheets, board games and song lyrics
http://www.esl-lounge.com/

Longman Pearson
http://www.pearsonlongman.com/

Lots of activities, worksheets and downloads for teachers and students.
http://www.esl-galaxy.com/

http://www.csun.edu/~hcedu013/eslplans.html

http://www.handoutsonline.com/

http://iteslj.org/