This has long been a favorite of mine and I'm rereading it for the umpteenth time because we'll discuss it in a couple of weeks on A Good Story is Hard to Find.

UPDATE
Perhaps it is because I'm nervous about Scott's reception of this book since he has not read much Terry Pratchett, but it seems less cohesive than I recall. I still am enjoying it a great deal and I see the themes that made me interested in discussing it, so that is ok (fable/myth vs. reality, belief, anthropomorphizing, Christmas customs and origins, etc.).