Robin Walker 's material.
http://englishglobalcom.wordpress.com/downloads/
lots on pronunciation, which for me is a basic part of my teaching as I understand learning a language as a two way thing: producing but also understanding.
Thanks Robin

For those who like art and the history of Great Britain, The Seven Ages of Britain offers a cool insight in fairly clear English for a good upper-intermediate student and advanced. You can find it on youtube.
Happy learning

slang words

http://www.bbc.com/news/magazine-27405988