Media Source for "Natural" Sounding Mandarin Chinese
the radio television hong kong has channel in mandarin; in their website, they've archive of past programme, or podcasts.

http://programme.rthk.hk/channel/radio/index.php?c=pth&amp;m=archive

the site design is a little bit "non-standard", just click any links, until you see "收聽 listen" with a headphone icon.

have fun :)