A great tip. Do you know the website Rachel's english? It's a famous website, i've watched it a few time ago, and it has been a great way to improve the pronunciation. Rachel is a great teacher and every week she adds a new video class , she teach step by step how to improve your pronunciation, every word, every letter, every sentence. There are many video class , take a look at http://www.rachelsenglish.com I hope you like :)