I am currently rereading Sun Tzu's "The Art of War".
@Thomc80: I agree with you 100% on Lovecraft short stories. I have dozens of paperback collections of his short stories and novels and they never ever ever get old. He was a master at creating fantasy worlds. Not many guys can make up a completely otherworldly setting complete with history, language, culture etc. in a 10 page story. And his writing has a way of sucking me right into the world he has created in text to the point of being able to feel the humidity, smell the air, feel the mentality of the culture...etc.