I found that :
The New Marine Aquarium: Step-By-Step Setup & Stocking Guide
is a great short-book that'll give you very good information in very little time. only about $14 on amazon. This provides a very good base of info and should be a quick read. I think it's under 200 pages.
I also am reading The Conscientious Marine Aquarist: A Commonsense Handbook for Successful Saltwater Hobbyists. I like the book, but every chapter seems to go into depth about the HISTORY of such and such... I find it a bit unneccessary, but it's still a good book and would recommend it.