I'm very, very new to this myself, but here are the books I currently have:
* Marine Fishes by Scott W. Michael
(Information & pictures of the different species of marine fish.)
* The Guide To Starting A Marine Aquarium by David E. Boruchowitz
(A rather quick read, this one reminds you to take things slowly, as well as advice on what you REALLY need at first and what can wait till later).
* The Marine Aquarium Problem Solver by Nick Dakin
(Have found this one to be quite helpful.)
* The New Marine Aquarium by Michael S. Paletta
(Haven't read this one--YET.)
* Keeping Saltwater Fish by Steve Halls
(This one has the Red Sea brand all over it, but has information that helps you understand why certain fish need certain things to thrive.)
One book I'm planning on getting is the Conscientious Marine Aquarist that I've heard so many people recommend.
Hope this helps and Good Luck to you!