With my purchase of Sourcery, I now own all the Discworld novels. And that depresses the hell out of me. There are still a few of the official maps and other things I need to get, but soon there will be no new Discworld for me to read until he releases new novels. At least Pterry is a very proficient writer, and a new one will be out in October. And yay it's a Wizard book, they are my favorite ones. Along with the Watch books. And the Witches. And the Tiffany Aching ones.