Firstly some links. The Java3D announcement is here:http://www.java-gaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=physics;action=display;num=1094475383
The binding was developed by a engineer from Sun but currently doesn't have a maintainer. I have not used it myself so I can't tell you much about it.
I wrote some info in response to a question about how the bindings work (a long time ago, and prior to that binding being posted) here: http://www.java-gaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=physics;action=display;num=1080816410;start=1#1
The harder task is the converter to take Odejava objects and represent them automatically in the 3D engine. Even this task is not that hard really if there is a good primitives library already, I do not know whether the java3D binding implemented this or not. The current code for Xith3D should be cleaned up mightily now to use the new org.xith3d.geometry package. IIRC that source file is a bit of a mess as it has been re-implemented a few times. Tell me if you need to work on this and I will endeavour to clean it up first.
Do you want to be the official maintainer for the Java3D binding? If you have the time for it this would be good. All you would need to do would be to keep it up to date with any relevant changes. The first task is putting it in CVS. Maybe you could provide some Odejava/Java3d demos as well if you are really keen.