With the advent of the NHibernate Users list, we also needed a place for frequent questions. While the Hibernate's site already has a FAQ in place, I feel that a blog is a better medium for this.
Therefor, welcome the NHibernate FAQ Blog, which Gabriel Schenker and Tom Opgenorth has agreed to maintained. There are several good articles there already. Covering anything from setting up query logging to correct handling of entity equality.