While listeners can choose from some 600,000 podcasts, I see a void that seems ripe for development: Cable networks creating their own podcasts. While a handful of cable channels have embraced audio, many others are on the sidelines. The way I see it, cable networks have all the ingredients to be players in podcasting: niche content, established audiences, popular hosts and a pipeline to distribution and promotion. Despite the growing number of cord-cutting consumers, cable channels still reach tens of millions of consumers and have established relationships with advertisers. So, I'll ask again, where are all the cable network podcasts?