Dave Minter and I have written several books together for Apress – Beginning Hibernate 3, Pro Hibernate 3, and Building Portals with the Java Portlet API. Beginning Hibernate 3 is now in its second edition (May 2010), and covers the recent Hibernate 3.5 release. Pro Hibernate 3 is from 2005, and Building Portals is from 2004, so both of those books cover old versions of the software.
I also wrote a few chapters for Wrox’s Professional Struts Applications, which was picked up by Apress after Wrox broke up. This book is out of date.