I have been looking at Public Chinese for a while now and although it is more of a paid service they do offer free music, flash videos. If your Mandarin Chinese is not too basic then these MP3 and flash files might be what you need to improve your Chinese. To help with your reading and writing you could try the Zhong Wen site.
Here is a link to a Taiwanese site, which offers free stories but mostly in Chinese but very easy and fun to navigate through.

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