Web Site Reference
Here are a few that maybe you forgot and also a couple of new ones.
www.answers.com the ultimate answer search engine (In this web site’s search box, try entering something like “English plural”)
http://esl.about.com ESL resources Covering all aspects of ESL (Listening, Speaking, Reading, Writing, Grammar, Vocabulary etc.)
www.puzzlemaker.com make your own word search or crosswords & more
www.starfall.com geared for children learning to read- so it’s simple and has audio
www.1-language.com lots of free ESL resources