Insiders' Guide to the Florida Keys and Key West, 13th (Insiders' Guide Series) I used this guide when I visited the Keys. It is organized by activity rather than by island. Great companion to Fodor's In Focus Florida Keys.
Florida Keys Paddling Atlas Simply the best. A beautiful book. Makes you want to pick up a paddle and hit the water!
Snorkeling Florida: 50 Excellent Sites The only book of its kind.
Key West Explained - a guide for the traveler Written by someone who lives in Key West.
Quit Your Job And Move To Key West : The Complete Guide Who doesn't need a book like this on their desk?
Diving Guide to Underwater Florida, 11th Edition Comprehensive. Includes offshore, near shore, beach diving, and freshwater springs.
Fodor's In Focus Florida Keys, 1st Edition The standard travel guide to the Keys. Best used along with the Insider's Guide to Florida Keys and Key West.