For some reason the podcasts are distributed along with language lessons on iTunes: Popup Chinese (iTunes).
For example, here's the most recent (June 14) episode:
This week on Sinica, Kaiser Kuo and Jeremy Goldkorn are delighted to host Matthew Niederhauser. A photographer focusing on urban development in China, Matthew has been published in various journals including The New Yorker, National Geographic, The New York Times Magazine, Le Monde, and Time Magazine among others. As Jeremy describes it, his visuals of Beijing and other parts of modern China capture the feeling of a society that operates on a scale both "beautiful and horrifying" at the same time. Matthew is currently working on a project documenting China's megablock urban development project. But all of his work is stunning.Here are some Neiderhauser photographs: