A hibernate tool that I would love to see would be one that would extract hibernate annotations from code and produce nice pretty dependancy diagrams so I can ensure everything is coded correctly when creating the model instead of finding out a day later when actually implementing. [ Don't you love those long run-on's? ]
The Hibernate Tools from hibernate.org are maturing well. The mapping editor and console view can be very helpful. Install eclipse, and then install the Hibernate tools plugins and you'll be impressed.