For those of you using NHibernate or wanting to use NHibernate as an O/R Mapper in your .NET Applications, NHibernate 2.1 was released. You can download the bits here.
Although based on an older version of NHibernate, version 1.2, you can buy a book to help you understand NHibernate, called NHibernate in Action.
For configuring NHibernate without using XML, you will want to check out the Fluent NHibernate project.
For those interested in using NHibernate with ASP.NET MVC, you will probably want to check out S#arp Architecture which was just released - ASP.NET MVC and NHibernate Framework Architecture - Download Sharp Architecture 1.0.
Check out other O/R Mappers.
David Hayden