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The Web is nowadays omnipresent: we use it at home for private reasons, and we use it at work for professional reasons; we use it for fun (eg, gaming) and for serious interactions (eg, home banking), via fixed stations and via mobile devices, and these are just few of the motivations for and the contexts in which we exploit such a powerful medium. The Web has indeed probably become the number one reason for private PCs at home, and the most important kind of “business card” for companies and institutions. Very likely, each of us has already tried at least once online applications such as Amazon. com for buying books or CDs, Ikea. com for buying furniture, and, of course, Google. com for searching Web sites. Similarly, most of us can no longer imagine a travel planning without the flight booking and hotel reservation systems that are accessible over the Web. We could cite many other examples where the Web is …