Much of the role previously played by 3dif.org has been transferred to other organizations. The U3D standardization activity has been moved to Ecma International and Ecma TC43. The U3D Sample Software development has been moved to the U3D Project on SourceForge.net. As a result, 3dif.org has been inactive for most of this year.
We have moved www.3dif.org to the U3D Project home page on SourceForge. There is a U3D discussion forum on SourceForge for continuing discussion of U3D topics.
You visit the archives of forum of 3dif.org here