Applying Domain-Driven Design and Patterns by Jimmy Nilsson
I first learned about DDD when I started on MonoRail a couple of years ago. However, DDD has been around longer than this. After I had been working with MonoRail and ActiveRecords for a while I started to dig deeper into the principles of DDD, so I also bought the Domain Driven Design by Eric Evans alongside this one.
The book contains good C# examples and it also describes how you can make your DDD solution run on NHibernate, which you might already know from MonoRail.
Because I have read both books, I can tell you that Jimmy has based this book on the principles from Eric Evans and also added some of the patterns from GoF.
If you want to kick start your DDD then this is a good book to start out with, due to the many code examples. However, when you have read this book, you might want to move on to Eric Evans, because some areas aren`t covered in greater depth.