I quite like The Edge of Sleep. It's a sort of serialized horror/suspense/drama, and it's only like five or six episodes long if I recall correctly. It's currently being adapted into a tv series, I think for Netflix!
Also a neat retro/nostalgic one (if you're into the 80s and 90s) is The Purple Stuff Podcast, which has been a favorite of mine for years. It's basically a couple of dudes reminiscing about pop culture crap from their childhoods, and it's pretty fun. :)