The idea occurred to me when I answered this question, specifically asking for resources for a D&D campaign focused in Amn.
I'm fairly new to RPG.SE (and SE in general), but a quick search for "resource" and "source" showed that there are dozens of these types of questions, which seem best suited to an answer in explanatory list form. For example,
- 1st (re)source - explanation
- 2nd (re)source - explanation
- 3rd, etc.
From what little I know of Community Wiki (CW), this seems to be the perfect way to answer (re)source-based questions since a single "regular" answer rarely covers all or, at times, even a majority of the possibilities and the best answer is usually a collection or compilation of multiple responses, including comments. CW would let everyone add their piece of knowledge into one complete, cohesive response rather than force readers to read all answers and comments to make sure they didn't miss something.
I saw that CW was overhauled a couple of years ago, but have yet to see an actual CW answer, so maybe I'm missing something (other than people not earning reputation)?