If you do not already own Going Postal by Terry Pratchett, run out and get yourself a copy now. I bought it through the Science Fiction Book Club. I was nice and let Ailsa read it first. She finished it Saturday night/Sunday morning. I started it today and just finished it about ten minutes ago.
This is an incredibly fantastic book. I think it is the best thing that Pratchett has ever written. I promise to write a more cogent review after I've had some sleep.