The following sites have been recommended by John Campbell who is a teacher at Alpha School of English in Malta.

www.nonstopenglish.com

www.onestopenglish.com

www.english-the-easy-way.com

www.eslcafe.com

www.tefl.net/links

http://totalcommunicator.com/archives.html

http://wordweb.info

(which is an excellent online dictionary)

John