One of the EngD students in our group has a very interesting project related to networked graphics: 3D Repo. 3D Repo is an online repository for storing, retrieving and versioning large 3D models. Although its not for real-time scene edits (at the moment), it is very suitable for storing world models for collaborative virtual environments, or for content production for a large scene. Its still in its early stages, but Jozef has had a lot of interest and new features are coming. Plus it will be open source.