I recommend a good website to leaning American-English,
http://www.voanews.cn/
At Learn a Word, you can pick up popular American-English words ,such as kick-off, sideline, pop up etc, if you understand these words, it will help you to enjoy American movies, that is ture.
At download center, you can download some audio files into your MP3, and listen it everywhere. These files including American culture, history, education, it is quite useful to help you to understand America and improve your English ability..