Just like the industrial society of the last century depended on natural resources, today's society depends on information and its exchange.Staab and Stuckenschmidt structured the selected contributions into four parts: Part I, "e;Data Storage and Access"e;, prepares the semantic foundation, i.e. data modelling and querying in a flexible and yet scalable manner. These foundations allow for dealing with the organization of information at the individual peers. Part II, "e;Querying the Network"e;, considers the routing of queries, as well as continuous queries and personalized queries under the conditions of the permanently changing topological structure of a peer-to-peer network. Part III, "e;Semantic Integration"e;, deals with the mapping of heterogeneous data representations. Finally Part IV, "e;Methodology and Systems"e;, reports experiences from case studies and sample applications.The overall result is a state-of-the-art description of the potential of Semantic Web and peer-to-peer technologies for information sharing and knowledge management when applied jointly.