December Books 4) Good Omens, by Terry Pratchett and Neil Gaiman
Although I'm a fan of both Pratchett and Gaiman, I don't quite get Good Omens, which seems to me to have the two writers not so much reinforcing each others' talents as toning them down. I did laugh out loud at the footnotes about firelighters and decimal currency, but I have to say that the book itself is rather a footnote in its authors' careers as far as I'm concerned.