Web is evolving at a speed never experienced by any other discipline before. This research book includes a sample of new research directions on Web personalization in intelligent environments. The contributions include an Introduction to Web Personalization, Semantic Content-based Recommender System, Exploiting ontologies for Web search personalization , How to Derive Fuzzy User Categories for Web Personalization, A Taxonomy of Collaborative-based Recommender System andA System for Fuzzy Items Recommendation. This book is directed to the researchers, graduate students, professors and practitioner interested in Web personalization.