It does come across as a Gaiman book with bits by Pratchett, as well.
... on that subject, I enjoyed "Stardust" too.
I'm a Gaiman fan, I haven't read much Pratchett.
I've first got to finish my six books that I'm in the middle of... then I can read it.
Christ: You should read Neverwhere.
P.S. One of my favorite books is to become a tv series on HBO: American Gods. Good Omens is rumored to be adapted for tv, as well.