I wanted to create same thread. But i think so special forum won't be enough. Why? Anteworld will be just a base for mods and user content. So i hope there will be a lot of custom models, textures, scripts etc. Just imagine what would happen, when you will want to download some new maps. You would have to download every model, texture separately for every map. I know so there is a time to create solution to resolve this problem, but i think so there should be some addon format just after model importer will be released, to keep compatibility with newer Anteworld version. So we could use time until final Anteworld version, to create our content.
The best solution would be creating special website, which would allow to browse addons. Every file could have its own, unique name, dependencies on other content (that would be useful for maps). In future it could be expanded with ingame feature or special program to install everything with one click.
I could create such site, but first i want to know, how it all will be looking, and if you are not going to create something like that already.