The proposition is a simple one: listen to as many of Channels’ topical menus (“20 Minutes of Relaxation,” “Meow! For Cat Lovers,” “Front Row Comedy,”) podcasts for just $4.95 per month. Or, if you are already an Audible subscriber, you can get Channels for free.
One of the problems that has yet to be solved (to my satisfaction, at least) is one of curation and discovery. This isn't a good solution, but it's a start.
(looking at you, iTunes.)