David Sherwin is a Senior Interaction Designer at frog design, a global innovation firm, where he helps to guide the research, strategy, and design of novel products and services for some of today's leading companies. David is an active speaker and teacher, and his writing has appeared in "A List Apart", "Design Mind", and other periodicals. He has worked at a wide range of creative agencies, from large marketing consultancies to smaller interactive agencies for clients such as AT&T, Cingular Wireless, Holland America Line, Onyx, Microsoft, Toshiba, and many others. He currently lives in Seatt...