This site is full of articles on topical events and issues written especially for ESL students. All of these articles are also available in MP3 format. Students can read along as they listen to the MP3 podcast, pausing or rewinding when necessary. VOA special English is a fun and effective way to increase vocabulary, improve pronunciation and sharpen reading skills.
VOA also has a link at the bottom of the page to Words and their stories which has short articles on various idioms in the English language. Words and Their Stories is available in MP3 format as well.