Relevant to this topic, Andrew Chak - an interactive architect - wrote a book in 2003 on web site design, with the fundamental premise that the experience designer's role is to not simply react to what user's think they want in a usable manner, but also to choreograph persuasive online experiences that compel users to modify their goals to increase the value derived by both the user and the business. (I hope I did his thesis justice in my summary; I haven't been close to this book in a while.)
http://www.amazon.com/Submit-Now-Designing-Persuasive-VOICES/dp/0735711704/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1215398882&sr=8-1Paul Eisen
Principal User Experience Architect
tandemseven
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