From National Public Radio (link):
Like everything else Internet-related in China, podcasts are exploding in popularity. From film parodies to pornography, audio and video downloads are pushing the boundaries of the law and decency.
Irishman Ken Carroll started podcasting Chinese lessons just over five months ago. His learn-with-Ken podcasts now attract more than 10,000 visitors a day, making it China’s No. 3 most popular podcast show. For Carroll, podcasting offers exciting new opportunities, where the old regulations for brick-and-mortar schools no longer apply.