JBoss EJB 3.0 is built on top of Hibernate 3.x. This gives in-depth knowledge of EJB3 Persistence and the Hibernate implementation. It will teach you how to run EJB3 Persistence out of the container
This gives in-depth knowledge of EJB3 Persistence annotations and Hibernate specific annotations.
You'll need Hibernate 3.0 Docs for knowledge on specific hibernate properties that JBoss EJB 3.0 requires.