Computer simulation of liquids is a classic when it comes to that particular subject. I can see why Allen and Tildesley's book is so popular - it lays down the foundations well. Even a person who hasn't dealt much with simulations will find it clear and understandable. That's because it starts ab initio, from the physical ideas and concepts behind the algorithms, and that, I believe, is something essential to a student of physics.
Really, I was stunned how nicely the book flows - from the set-up (first two chapters of the first part, "Introduction"), over the idea of potential and various interactions, periodic boundary conditions... Then the great part on the statistical mechanics (although I learned that part previously from Hansen's book, it's always good to revise :D), the nicely detailed pages on integration in MD... Granted, I haven't went through MC (because it's not my primary interest) or the more advanced stuff in the later chapters (like "Brownian dynamics" and "Quantum simulations"), but what I've read and learned from it helped me to reach my verdict regarding my rating. What can I say, it's a great book. I wasn't blown away by it as much as I was with some other books (*cough*Atkins*cough*), but upon further questioning my stance, I decided to give it 5 stars. It's a classic, it's excellent and you can get a lot out of it.