The term peer-to-peer has come to be applied to networks that expect end users to contribute their own files, computing time, or other resources to some shared project. Even more interesting than the systems' technical underpinnings are their socially disruptive potential: in various ways they return content, choice, and control to ordinary users.While this book is mostly about the technical promise of peer-to-peer, we also talk about its exciting social promise. Communities have been forming on the Internet for a long time, but they have been limited by the flat interactive qualities of email and Network newsgroups. People can exchange recommendations and ideas over these media, but have great difficulty commenting on each other's postings, structuring information, performing searches, or creating summaries. If tools provided ways to organize information intelligently, and if each person could serve up his or her own data and retrieve others' data, the possibilities for collaboration would take off. Peer-to-peer technologies along with metadata could enhance almost any group of people who share an interest--technical, cultural, political, medical, you name it.This book presents the goals that drive the developers of the best-known peer-to-peer systems, the problems they've faced, and the technical solutions they've found. Learn here the essentials of peer-to-peer from leaders of the field:

Nelson Minar and Marc Hedlund of target=new>Popular Power, on a history of peer-to-peerClay Shirky of acceleratorgroup, on where peer-to-peer is likely to be headedTim O'Reilly of O'Reilly & Associates, on redefining the public's perceptionsDan Bricklin, cocreator of Visicalc, on harvesting information from end-usersDavid Anderson of SETI@home, on how SETI@Home created the world's largest computerJeremie Miller of Jabber, on the Internet as a collection of conversationsGene Kan of Gnutella and GoneSilent.com, on lessons from Gnutella for peer-to-peer technologiesAdam Langley of Freenet, on Freenet's present and upcoming architectureAlan Brown of Red Rover, on a deliberately low-tech content distribution systemMarc Waldman, Lorrie Cranor, and Avi Rubin of AT&T Labs, on the Publius project and trust in distributed systemsRoger Dingledine, Michael J. Freedman, andDavid Molnar of Free Haven, on resource allocation and accountability in distributed systemsRael Dornfest of O'Reilly Network and Dan Brickley of ILRT/RDF Web, on metadataTheodore Hong of Freenet, on performanceRichard Lethin of Reputation Technologies, on how reputation can be built onlineJon Udell ofBYTE and Nimisha Asthagiri andWalter Tuvell of Groove Networks, on securityBrandon Wiley of Freenet, on gateways between peer-to-peer systems

Andy Oram is an editor at O'Reilly & Associates, specializing in books on Linux and programming. Most recently, he edited Peer-to-Peer: Harnessing the Power of Disruptive Technologies.