Good Omens, Neil Gaiman & Terry Pratchett, is Armageddon played for laughs. This is getting to be a pretty common theme in modern SF/F, my favorite of the genre being Robert Rankin's trilogy Armageddon: The Musical; They Came and Ate Us; and The Suburban Book of the Dead. (I hear good things about his The Hollow Chocolate Bunnies of the Apocalypse, but haven't read it yet.)
I'm a fan of Neil Gaiman, who has earned a spot on my read-everything-he/she/it-does list. I've not read Pratchett, and basically have been avoiding him so as 1.) not to steal the tropes of another SF satirist, and 2.) not to have to add him to that same list.
I enjoyed, but did not deeply love, this one. Until the end, it mostly just played word and expectation games, though there were quite funny individual scenes. When Armageddon actually comes, though, and the characters are brought to their fates, it went up two or three notches. I approved of its endings.
"...She felt she looked haunted and gaunt and romantic, and she would have, if she had lost another thirty pounds. She was convinced that she was anorexic, because every time she looked in the mirror she did indeed see a fat person."
"...It's like the man said in the history books. A plaque on both your houses."
CBIP: Someone Comes to Town, Someone