YCC Sailing course for beginners
The racing rules of sailing 2005-2008
The Klutz Book of Knots
Sailing Yacht Performance - The Effects of Heel Angle and Leeway Angle on Resistance and Sideforce
RYA Competent Crew and Yacht Skipper
Principles of yacht design - Larsson, Eliasson
Plans For A Catamaram Sail-Boat
Manual Of Yacht And Boat Sailing And Architecture - Kemp
Hydrodynamic Modeling Of Sailing Yachts
100 Boat Designs Reviewed
Hobie University

i read them all, and you can find them on the net for free

helps a lot