The book "Intelligent Interactive Multimedia Systems and Services" documents the proceedings of the 4th International Conference on Intelligent Interactive Multimedia Systems and Services (IIMSS-2011). This conference is a continuation of a series of events that took place in 2008, 2009, and 2010, focusing on the latest developments in research on intelligent multimedia systems. Organized by the Department of Computer Science at the University of Piraeus in Greece and the School of Electrical and Information Engineering at the University of South Australia, this work provides a comprehensive overview of innovative approaches to enhancing interactivity and usability in modern multimedia applications. In an era where computers are ubiquitous in all areas of life, it is crucial that these systems not only support traditional input methods but also offer alternative forms of interaction to reach a broader user base, including individuals with special needs. The book is aimed at professionals and researchers dealing with the challenges and opportunities of intelligent multimedia technology.