I have started some documentation - but only the beginner stuff at the moment - email me directly if you would like to see what I have done so far.
What I would do first in your position is get the current examples working with LWJGL (i.e. port the org.odejava.xith3d.test package and to a lesser extent the org.odejava.xith3d package).
read the javadocs and my forum post on how to do this. Hint - checkout the org.odejava.display package.
You basically have to create a plugin so that Odejava can talk to your display objects. Optionally, you can set it up to view a default view of the odejava geoms (for example rendering a box as a box...) I recommend this as it's great for visualisation and debugging.
Read this: http://www.odejava.org/javadoc/org/odejava/display/package-summary.html
Some "binding" related forum topics:http://www.java-gaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=physics;action=display;num=1080816410http://www.java-gaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=physics;action=display;num=1078922931
Odejava is ODE really - you need to learn how ODE works and there is some great documentation on that thanks to Russ. Then you need to learn how Odejava uses ODE (if indeed you want to use the high level api and not just hte low level api). It's fairly intuitive and we are trying to make it as close as object orientationaly possible.
Subscribe to the ODE mailing list too.http://opende.sourceforge.net/
If there's something you can do in ODE but not Odejava (old since fixed example: Mult-Geoms in a group) - hassle us or code it yourself
I am considering setting up Odejava.org the same as xith.org. Would anyone be interested in helping contribute content such as tutorials and examples to the site?