Not on NU but I really like Hitchhiker's Guide to the Galaxy, from Douglas Adams. It's the funnier book I ever read, without a doubt. If you'd like something more historical I recommend the Saxon Chronicles, from Bernard Cornwell - as well as the rest of his work, actually. From NU, I'd recommend Lazy King and Lazy Dungeon Master, they are good. And the classic Coiling Dragon , in case you still haven't read it yet and like cultivation.