So far my favourite book about the whole DDD topic. Although I don't have any experience in .NET it was quite easy for me to understand the idea and I learned about about the language as well. Apart from that, the examples are clear and easy to understand and I really appreciate the structure of the chapters with the short explanations in theory, than code examples and a short summary at the end.
Patterns, Principles, and Practices of Domain-Driven Designvon Scott MillettJohn Wiley & Sons