What may be of interest to me, may be boring to you, but since you did not specified exactly (you did in a general way) the topic of your interest in podcasting, I will share a few with you, with a brief explanation for each.

Favorite Chinese-language Podcast:

BBC China Focus
Running about 20 minutes each, the BBC Chinese Service releases a daily China Focus Podcast that combines news coverage, editorials and a brief sampling of user comments on the BBC forum.

Also good:

NHK NW China News provides a daily10-15 minute round up of international news in Mandarin.
 

Best Business Podcast:

China Business Podcast
Technomic’s aptly-named podcast offers thoughtful coverage of various aspects of operating a business in China, and the occasional vignette on expat life.

Also good:

the Cool Aid BizCult’s amateur-looking website features this suspiciously-named podcast, with some sketchy episodes, including one alluding to the creator’s infidelity to his wife.
 

Best Politics Podcast

Sinica
Part of the Popup Chinese language-learning podcast, Sinica is a consistently well-produced bimonthly podcast on political and social issues pertaining to China. Host Kaiser Kuo and his guests take the news provided by the international media to the next level through surprisingly smooth conversations with sharp insights and a good sense of humor.

Also good:

China Talking PointsThe CTP podcast, (of the China Talking Points blog), is considerably less regular and well-produced, but the two hosts have covered some issues from more interesting angles, such as their podcast on the problems of China’s shrinking population.