db4o-netbeans is available in 0.6.0 now.
Since my time is very limited, I moved in small steps with the plugin only. However, some things have been added, some things have been stabilized.
Documentation has been updated. Go to the db4o-netbeans home or download directly from here.
Well, as ever, any feedback is appreciated.
Soon, after finishing the most important basic features to the plugin, I will have a look on how to add support to the Visual Web Pack integrated into NetBeans. This will be good milestone for a tight integration of db4o database into NetBeans. If only time wouldn't be such a problem...