Introducing LINQ—Language Integrated Query
http://www.codeproject.com/Articles/199060/Introducing-LINQ-Language-Integrated-Query

LINQ to SQL: Basic Concepts and Features
http://www.codeproject.com/Articles/215712/LINQ-to-SQL-Basic-Concepts-and-Features


LINQ to SQL: Advanced Concepts and Features
http://www.codeproject.com/Articles/230380/LINQ-to-SQL-Advanced-Concepts-and-Features

WCF: Loose coupling of WCF Service and Data Contracts
http://www.codeproject.com/Articles/55690/WCF-Loose-coupling-of-WCF-Service-and-Data-Contrac



http://www.codeproject.com/Articles/215712/LINQ-to-SQL-Basic-Concepts-and-Features

http://weblogs.asp.net/owscott/archive/2007/09/02/application-vs-appdomain.aspx
http://blogs.msdn.com/b/adonet/archive/2009/05/28/poco-in-the-entity-framework-part-2-complex-types-deferred-loading-and-explicit-loading.aspx