This book constitutes the thoroughly refereed post-workshop proceedings of the 7th International Workshop on Agents and Peer-to-Peer Computing, AP2PC 2008, held in Estoril, Portugal, in May 2008 and the 8th International Workshop on Agents and Peer-to-Peer Computing, AP2PC 2009, held in Budapest, Hungary, May 2009, co-located with the International Joint Conference on Autonomous Agents and Multi-Agent Systems, AAMAS. The 13 revised full papers presented were carefully reviewed and selected from numerous submissions. The volume is organized in topical sections on social welfare, distributed information sharing, and network organization and efficiency.

This book constitutes the thoroughly refereed post-workshop proceedings of the 5th International Workshop on Agents and Peer-to-Peer Computing, AP2PC 2006, held in Hakodate, Japan, in May 2006, in the context of the 5th International Joint Conference on Autonomous Agents and Multi-Agent Systems, AAMAS 2006.

The 10 revised full papers and 6 revised short papers presented together with 1 invited paper were carefully reviewed and selected from 23 submissions; they are fully revised to incorporate reviewers' comments and discussions at the workshop. The volume is organized in topical sections on P2P Infrastructure, agents in P2P, P2P search, and applications.

This book constitutes the thoroughly refereed postproceedings of the 3rd and the 4th International Workshop on Databases, Information Systems and Peer-to-Peer Computing, DBISP2P 2005 and DBISP2P 2006, held in Trondheim, Norway, in August 2005 and in Seoul, Korea, in September 2006, as satellite events of VLDB, the International Conference on Very Large Data Bases.

The 39 revised full papers presented together with 1 invited contribution were carefully selected during two rounds of reviewing and improvement. According to the sessions held in the two editions, the papers of DBISP2P 2005 are organized in topical sections on knowledge discovery and emergent semantics, query answering and overlay communities, indexing, caching and replication techniques, complex query processing and routing, semantic overlay networks, services, agents and communities of interest. The papers of DBISP2P 2006 are thematically divided into data placement and searching, semantic search, query processing and workload balancing, as well as continuous queries and P2P computing.

This book constitutes the thoroughly refereed post-proceedings of the 4th International Workshop on Agents and Peer-to-Peer Computing, AP2PC 2005, held in Utrecht, Netherlands, July 2005, in the context of the 4th International Joint Conference on Autonomous Agents and Multi-Agent Systems, AAMAS 2005. The 13 revised full papers cover trust and reputation, P2P infrastructure, semantic infrastructure, as well as community and mobile applications.

This book constitutes the thoroughly refereed post-workshop proceedings of the 6th International Workshop on Agents and Peer-to-Peer Computing, AP2PC 2007, held in Honululu, Hawaii, USA, in May 2007, in the context of the 6th International Joint Conference on Autonomous Agents and Multi-Agent Systems, AAMAS 2007.

The 8 revised full papers presented together with 1 summary paper were carefully reviewed and selected from 14 initial submissions; they are fully revised to incorporate reviewers' comments and discussions at the workshop. The volume is organized in topical sections on agent and peer trust, performance and testing, grid and distributed computing, as well as location and search services.