Omniglot (a very cool site about languages of the world) maintains a good list of online radio stations in many, many different languages. Listening to authentic radio broadcasts is a great way to practice real-life listening comprehension while learning about local news, music, and culture at the same time!
Chinese: http://www.omniglot.com/links/radio.htm#chinese
There are many more Asian language radio links on the site, as well!