Programming WCF Services by Juval Löwy is one of the pre-mier books on WCF. This is the 3rd edition of this book that includes .NET 4.0 and Azure AppFabric Service Bus. It is a good book both for developers who would like to migrate from conventional web service / windows service to the new paradigm and for programmers who are well versed with the tech-nology. The book is structured well and covers everything from design, development to maintaining. Learn about WCF architecture and essential building blocks, including key concepts such as reliability and transport session. Use built-in features such as service hosting, instance and concurrency management, transactions, disconnected queued calls, security and discovery. Master the Windows Azure AppFabric Service Bus, the most revolutionary piece of the new cloud computing initiative. Increase your productivity and the quality of your WCF services by taking advantage of relevant design options, tips and best practices in Lowys Service ModelEx Framework. Title: Programming WCF Services, Third Edition Author: Juval Löwy Publisher: O'Reilly Media Year: August 2010 Windows Communication Foundation (WCF) is a part of the .NET Framework that provides a unified programming model for rapidly building service-oriented applications that communicate across the web and the enterprise. WCF was first released as part of the .NET Framework 3.0 in 2006, and then updated in the .NET Framework 3.5, the most recent version of this technology is included in the .NET Framework 4.0. The book is organized into eleven chapters and seven appendices to give a complete, and comprehensive, coverage of WCF. The chapter 'WCF Essentials' discusses the basics of WCF and gives an insight into WCF concepts and architecture. The chapters on Service Contracts and Data Contracts talk about some useful techniques for service contract overloading, inheritance & designing of contracts that cater to reuse, maintainability, and extensibility. There is a chapter on Instance Management - a tech-nique that impacts scalability, performance, programming model and business workflow, different chapters on Exception Handling, Transaction Management and Concurrency Management highlight callback, thread affinity and managing asynchronous calls. The chapter on Queued Services shows how clients can queue up calls to services, thus enabling asynchronous, disconnected work. ANSHU ROHATGI Regional Editor, NIC UP anshu.rohatgi@nic.in However, one of the most critical aspects of Service Oriented Architecture (SOA) is security whether intranet/internet based, any service is open for malicious attacks, assessments of delegation and impersonation etc. An exclusive chapter on Security explains various scenarios of attack and goes on to explain the various suggested security implementation to automate security setup and to considerably simplify managing security. Finally, the chapter eleven presents the Windows Azure AppFabric Service Bus. Normally, people just glance through or skip appendix section of the books. This one is an exception where topics covered under appendices make excellent reading, and are very informative. Introduction to Service Orientation, WCF Coding Standard, Generic Interceptor are worth mentioning here, while another great aspect of the book is the extremely powerful diagrams that have reduced complex topics into easily understood drawings. The book does an outstanding job of systematically and thoroughly uncovering practically all aspects of WCF programming. Not only it presents a simple to understand architectural picture of WCF in gen-eral and various architectural and functional subsystems, but also abandons with practical and thorough explanations of the details of virtually all aspects of WCF.