John, I highly highly recommend
Java Persistence with Hibernate book.
I know a lot about Hibernate, I have used it for years and have taught it. I learned a lot of insider information about how Hibernate works, teaching the class.
But, I would say I have learned so much more from that book. The book covers every bit of Hibrenate, whereas the previous version Hibernate IN Action covered a lot, but left a lot out. No longer the case.
Mark