"EntitySpaces is an easy-to-use, high-performing .NET Object Relational Mapping (ORM) tool. If your organization is evaluating ORM tools, I would recommend that you add EntitySpaces to your list."   -- Vijay P. Mehta

While this book isn't specifically about EntitySpaces we do get some kinds words from it's author in the section of the book that does takes a look at EntitySpaces.

Author Information

Vijay P. Mehta has been working as a software engineer and architect for the last 12 years. Starting off in the VC++/ATL, MFC, Win32, and VB6 worlds, Vijay later moved on to Java and .Net development. With his current focus on C# and .Net, Vijay holds a number of Microsoft certifications and has written a number of articles on .Net and Microsoft–focused development. Currently working as an Architect for a financial services software company in Indianapolis, Vijay spends the bulk of his time designing and implementing large, cutting-edge software systems.

For more information see Pro LINQ Object Relational Mapping in C# 2008

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Persistence Layer and Business Objects for Microsoft .NET
http://www.entityspaces.net