I'd say The Dark Tower series are more on the parallel universe area. That being said, I do not recall whether Blaine the Mono is steam-powered or not
EDIT: Oh wait... forget what I said about Blaine the Mono above... I was replying to a thread in another forum, talking about steampunk, and somehow I got these two threads --one talking about post apocalyptic and the other about steampunk-- mixed in my mind...
