TCMA, "Marine Fishes" Pocket Guide and it's "Marine Invertebrates" companion, "Reef Fishes" series, the Delbeek and Sprung series. Often overlooked, "The Modern Coral Reef Aquarium" series by Fossa and Nilsen, as well as the "condensed version" Reef Secrets, are awesome. Can't leave out Borneman's "Aquarium Corals" as probably the best hobby reference for corals out there. Tullock's "Natural Reef Aquariums" is good as well. He's also coming out with a beginner's book, and so is Carl DelFavero from a troubleshooting/problem solving standpoint.