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"Aquarium Corals," by Eric Borneman
"The Reef Aquarium," Volumes 1-3 by Charles Delbeek and Julian Sprung
"Corals Of The World," by J.E.N. Veron
"Soft Corals And Sea Fans," by Katherine Fabricius and Philip Alderslade
"Aquarium Corals," by Eric Borneman is probably the best book for beginners and somewhat advanced aquarists. "The Reef Aquarium" series has always been considered the bibles of reef keeping...matter of taste really. "Corals Of The World" can be purchased on cd (computer) as well and is primarily scientific Scleractinian based whereas "Soft Corals And Sea Fans" is a scientific version of Octocorallia. I will say, there are very few soft coral taxonomists and considering soft coral identification is rather tedious, I highly recommend eventually purchasing that book