My reservations vs podcasts are also true via audio books. I'm never going to find time to listen to them - and if I did, I'd rather read them instead. I've glanced around in the provided links, but really haven't found anything that interested me.
If anything, I am less interested in Audio books than podcasts. An audio book, by definition, implies that there might be a hard copy somewhere. If I saw anything interesting in here, I'd pursue the hard copy instead.