I haven't read too many of the books, but a few days ago I randomly picked up The Marksmanship Lesson. Really cool little story, I enjoyed it. Now my character is picking up all the books he can find so I can read them :read: . They are good! They really flesh out the universe. And reading them while I'm actually playing the game makes it feel that much more real, very atmospheric.
I love them. How 'bout you?