http://spokenskills.com/index.cfm?type=15&content=studentactivities
http://www.englisch-hilfen.de/en/exercises_list/aussprache.htm
http://shiporsheep.com
http://cambridgeenglishonline.com/Phonetics_Focus/
http://www.bbc.co.uk/worldservice/learningenglish/grammar/pron/
http://manythings.org/pp/