Hibernate only works on Railo 3 and ColdFusion 8.0.1. Both ColdFusion 8.0 and Open BlueDragon's initial release have classloader issues that prevent it from working.
Installing CF Groovy is a simple two step process:
groovy-all-x.y.z.jar from the groovyEngine directory into your /WEB-INF/lib folder.
After you've done that, start clicking the demos in the left pane.
To run the Hibernate demos, you need to create a DSN in the server admin named "cfgroovydemo". It should point to an empty database, and the user should have sufficient privileges to create and alter tables, columns, indexes, and keys. The database must be one of those that Hibernate supports, which is basically everything.
The latest code can always be obtained from Subversion:
Also check the project homepage at http://www.barneyb.com/barneyblog/projects/cf-groovy/ for updates and information.