Some of the activity is on mailing lists. Check web3D.org for x3d-public. Google returned 2,600,000 hits, so I guess most questions have already been answered. The standards are very mature, but continued efforts are being made for improvements. There is no question about X3D's acceptance. It is widely in use in various settings for training, research and many other 'serious' applications that are not necessarily on the Web. The military and NASA are using it for instances, so you can't go very wrong. As far as acceptance over the Internet, there is not an issue with X3D itself, but rather an issue with general acceptance of 3D. With the proliferation of game consoles, it made more sense for a long time to play games that way instead of downloading large quantity of content with limited bandwidth. Plus, consoles are more apt at processing and delivering content rapidly for faster user experience than most people's work computers. However, you can find that X3D will be better suited for MMOG and virtual worlds than anything else out there, especially when very large numbers of users begin to interact. What is really missing is the killer app, and this has little to do with the language or format itself. You can build X3D worlds with as many "semi-independent" files or modules as you want, and use externproto's together with Javascript to glue it all together. This relates more to developers' implementation than anything else. In the end, if you want to do 3D on the Internet, you do not have much choice but go with the standards, especially if you want to do something that is highly interactive. Companies that don't, are essentially building closed systems that can in the end become their demise when integration and convergence begin to occur. An exception to that could be HTML5 with WebGL and Javascript, but that can be excruciatingly slow, it is in its infancy, and not supported with IE, so mostly good for limited applications. Compared to X3D, which is much faster and light-years ahead, I think it's a no brainer, but that always depends of what you want to accomplish. Hope this helps. Cheers,