I read this book in an afternoon and I still refer to it to help friends with the basics of kayaking. If you are just starting out paddling, then a Sit on Top is a great first boat. If you are an experienced paddler but not an instructor this is a great book to share with beginners and to review with the friends you take along.
It's available at TopKayaker.net at:
Tom's Store has most commercial kayak sailing rigs and many other paddling accessories, and he is a very helpful guy.