Many English students complain that they understand English, but don't feel confident enough to join a conversation. There are a number of reasons for this including:

-Students are trying to translate from their native language into English.
-Production "blocking" is occurring due to nervousness, lack of confidence, etc.
-The speaker is looking for a specific word, rather than using simple language to describe what is meant. There aren't enough conversation opportunities in or outside of class.
-Students aren't able to speak to peers (for example: mixed classes of adults and teenagers).
-Exam preparation focuses on grammar, vocabulary, etc. and leaves little time for active use.
http://esl.about.com/od/speakingenglish/a/speaking_hub.htm

Good links:
http://iteslj.org/links/ESL/Pronunciation/
http://www.bbc.co.uk/worldservice/learningenglish/multimedia/pron/
http://www.manythings.org/pp/
http://www.englishelearning.com/en/pp1.html
http://www.englishclub.com/pronunciation/index.htm
http://www.fonetiks.org/
http://www.bartleby.com/61/12.html

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