Randall's ESL Listening Lab

http://www.esl-lab.com/

Randall's ESL Listening Lab has hundreds of online American English listening activities, most of which are organised by level - easy, medium and difficult. There are also some beginner lessons. There are also categories for EAP listenings, 20 minute lessons, language learning and life tips as well as long video lessons.
Each lesson has five parts:
1. pre-listening exercises
2. listening exercises
3. vocabulary
4. post-listening exercises
5. online investigations