A new updated version of the Hibernate Tools (http://tools.hibernate.org) project have been made available.
The tools are for both Eclipse and ANT, the ANT related docs are at http://www.hibernate.org/hib_docs/tools/ant/index.html
The biggest new feature is that you can now use your annotated classes in the query console (require JDK 5) and thus be able to prototype EJB3 queries.
We also added support for named parameters in the query console making it very easy to test existing queries from your application since you do not need to replace the parameters with inplace values.
See the screenshots and other noteworthy news at http://www.hibernate.org/hib_docs/tools/eclipse/newandnoteworthy/hibernate-eclipse-news-3.1.0.beta1.html for more information.
As always feedback, ideas, contributions, patches, bug-reports are more than welcome by the usual means at http://forum.hibernate.org and JIRA.