This volume focuses on new challenges in distributed information filtering and retrieval. It collects invited chapters and extended research contributions from the DART 2011 Workshop, held in Palermo, Italy, in September 2011, co-located with the XII International Conference of the Italian Association on Artificial Intelligence. The main focus of DART was to discuss and compare suitable novel solutions based on intelligent techniques applied to real-world applications. The chapters of this book present a comprehensive review of related works and the state of the art. Authors, both practitioners and researchers, shared their results on several topics such as multi-agent systems, natural language processing, automatic advertisement, customer interaction analytics, and opinion mining.