I assumed it would just be handled the same way the existing threads have been managed all this time (which is to say, fairly loosely). So one of you can start a thread and we'll Sticky it, or if you prefer, we can start the thread and introduce it briefly (e.g. "This thread is for posting of Terragen texture networks in TGC or TGD format" etc.).
As far as what object(s) to use, I personally like the idea of a standard object or set of objects (at different scales), but I do see it may be too complicated or not adhered to by everyone. The nice thing about shared resources, of course, is that anyone could download it and then submit a preview on the appropriate object.
Ultimately forum threads are not the truly ideal place to share and *organize* this stuff, but it's a good place to start. Long-term perhaps a new section of the Wiki (files can be uploaded), or a specific file sharing system can be used.
- Oshyan