On a related note, "Riddley Walker" made the cut in Anthony Burgess's "99 Novels" which, considering the inventive language of that and "A Clockwork Orange", isn't too surprising. But "Riddley" is hard to get into for a lot of people, unsurprisingly. I've read a few of his other novels, too, and they are interesting and wry. It's a pretty strange book, but I particularly like "Medusa Frequency".

Hoban also wrote the book that the "Emmet Otter's Jugband Christmas" movie is based on.