This week's book giveaway is in the Java in General forum. We're giving away four copies of Think Java: How to Think Like a Computer Scientist and have Allen B. Downey & Chris Mayfield on-line! See this thread for details.
Hibernate on it's own is an ORM framework. JPA which is part of EJB3 is a standard API for Java persistence. And hibernate has an implementation of JPA which you can use. Of course Hibernate has it's own native API that you can use without JPA, which is how hibernate being used from the beginning.