NHibernate's out of the box features

How does NHibernate provide out of 开发者_StackOverflow中文版the box features as compared to the other OR/M tools available like ADO.NET entity framework and LINQ to SQL?

Here are some feature comparisons:

• NHibernate, Entity Framework, active records or linq2sql
• NHibernate vs EF 4
• NHibernate vs Lightspeed