I was also thinking about how well a wiki would serve me in organizing my campaign notes. Rather than have a few long text files I can have a location and it's NPCs, and click a link to take me to the page detailing the place they travel next.
This lead me to wonder if if there was a wiki where people collaborated on a setting. I know people on here use it for campaign notes, but they all say "brought to you by DM x." I know I would enjoy using a setting which, due to the actions of other DMs and parties, grew beyond my own input. Plus, if my campaign notes influence someone else's game then I'd feel that my work bore more fruit.
Is there such a wiki somewhere, or something similar? If not, would anyone be interesting in such an open co-operative effort?