A simple, straightforward tutorial that will get you up to speed on the fundamentals of NHibernate as quickly as possible
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Object Relational Mapping (ORM) using NHibernate - Part 1 of 8 Coding One to One Entity Associations
Test Driving NHibernate 3.0, LINQ and the Entity Framework CTP 5 with the Abstract Factory Design Pattern
Simple "Contact Book" web application using VisualJS.NET, Fluent NHibernate and ASP.NET Web Forms on MS SQL Server 2012
Object Relational Mapping (ORM) using NHibernate - Part 3 of 8: Coding One-to-Many Entity Associations