Try and find this app for iPhone:
XimalayaFM
It's really good. It has audio books and podcasts etc. lots of great content. A lot of free stuff, even including audio books in English. I just got done listening to The old man and the sea, and the first book in The Tibet Code series in Chinese.
Somethings in there you have to pay for, but if your main ambition is to practice your Chinese you should never really need to. Lots of great stuff for free.