Successful Sunfish Racing
This book is in print as part of The Sunfish Bible, which also contains the books Sail It Flat, and The Sunfish Book, plus additional articles.
http://www.amazon.com/Successful-Sunfish-Racing-Derrick-Fries/dp/0828600953/ref=sr_1_7?s=books&ie=UTF8&qid=1294839296&sr=1-7