Just finished Bill Simmons's The Book of Basketball, which is very informative, especially if you are (as I am) only casually familiar with the sport's history.
Warning - it's a tome (700+ pages). Several sections could easily have been shortened or omitted altogether. But the good thing is, it's not a novel, and you can easily skip around and just read the parts that are interesting. His section on the Pyramid, and his evaluation of the greatest teams ever, were both highly entertaining.