Hope you'll have fun while improving your English listening here!
First, make sure you have Real Player and Media Player on your computer.
Useful Online Dictionaries:
Longman Dictionary of Contemporary English (http://www.ldoceonline.com/)
Cambridge Dictionaries Online (http://dictionary.cambridge.org)
Merriam-Webster Online (http://www.m-w.com/)
Encarta (http://encarta.msn.com/encnet/features/dictionary/dictionaryhome.aspx)
Live ABC (http://www.liveabc.com/site/online_store/resource/p_dictionary/dict_dex.asp)
Language Guide (http://www.languageguide.org/english/tw/)
Howjsay.com (http://howjsay.com/)