The series was (after having the name refactored a couple of times) called A Journey with Domain Driven Design (and NHibernate). In the series Ben manages manages to cover a few design patterns, some TDD concepts and examples, separation of concerns, configuring NHibernate, writing mapping files and pulling it all together.

Following are the links to the articles and a quick overview of what each part covers:

• Part 1 – Describes the reasoning behind his approach and the project structure used in the series.
• Part 2 – Covers the application and its requirements and begins designing the domain model.
• Part 3 – Demonstrates writing basic unit tests for the domain model.
• Part 4 – Demonstrates more sophisticated tests that include interactions between domain entities.
• Part 5 – Database design strategies, configuring NHibernate and starts unit testing the persistence assembly .
• Part 6 – NHibernate class and component mappings and some tests to check they’re working as expected.
• Part 7 – NHibernate collection and association mapping.
• Part 8 – Some refactoring, the introduction to use of the Repository pattern and use of the Template Method design pattern.
• Part 9 – Wrapping up the feature list and a link to download the latest version of the code.

The series is excellent and recommended reading if you are trying to get off the ground with DDD and NHibernate.