A PRACTITIONER’S GUIDE TO PROTOTYPING is a book in progress by Todd Zaki Warfel. The anticipated publication date is late 2008.
From the website,
A Practitioner’s Guide to Prototyping will take a hands-on approach, enabling you to develop prototypes with minimal muss and fuss. The book will discuss how prototypes are more than just a design tool by demonstrating how they can help you market a product, gain internal buy-in, and test feasibility with your development team.