Search engine. Search engines - "web dragons" - are the portals through which we treasure trove of information society access. What role will libraries play in a world of information is governed by the web? A researcher or journalist for whom the web has changed the very way you work? Witten is a professor of computer science at the University of Waikato, where he directs the New Zealand Digital Library research projects. He has published widely on digital libraries, machine learning, text compression, hypertext, the synthesis of speech and signal processing, and computer typography. A fellow of the ACM, he has written several books, including How to Build a Digital Library (2002) and Data Mining (2005), both from Morgan Kaufmann. Marco Gori is professor of computer science at the University of Siena, where he led a group of artificial intelligence research. He is Chairman of the Italian Chapter of IEEE Computational Intelligence Society, a fellow of the IEEE and of ECCAI, and former President of the Italian Association for Artificial Intelligence. Numerico Teresa teaches network theory and communication studies at the University of Rome 3, and is a researcher in Philosophy of Science at the University of Salerno. * Presents a critical view on the idea of distributing access information through a small handful of gateways and the notion of a centralized index - and the problems that can cause. * To provide a promising approach to overcome the problem, such as personalized web services. * Presented by the authorities in the field of digital libraries, web history, machine learning, and web and data mining. * Find more information on the author's site: webdragons.net.