If you want to improve your pronunciation in English, try this excellent site at http://www.fonetiks.org/ and make sure your sound speakers are on!
You can hear all the vowel and consonant sounds in British, American, Australian, Canadian, Irish, Scottish and Welsh English. Check also the pronunciation guide to names.
There are lots of useful pages here - try for example the 'ship or sheep' page at http://www.fonetiks.org/shiporsheep/.
There are also 11 other languages to choose from!
