Speaking of books, there are two things I personally would alter if I had the ability. One is making resources able to provide all kinds of things in themselves instead of merely health and happiness. All the yields, commerces and types of experience could potentially be provided by resources. Also I'd seperate the generation of great artists from the other GP's (and make it dependant on the culture slider, not GP-points), these produce hit movies/great plays/whatever and the like instead of some wonder doing it. These cultural resources will also have a limited time-span, say 100 turns on normal or something before they fade away making it rewarding to continually produce movies for your movietheatres e.t.c.