http://www.scp-wiki.net/main
This was linked to "Rock paper shotgun". It seems to be a collaborative effort built around a fictional "Foundation", that keeps track of dangerous and mysterious artifacts. I've never been into fan fiction (and I suppose this isn't really fan fiction), but some of the stuff is interesting and some genuinely creepy. They read like executive reports which gives them a sense of verisimilitude (it can also make it difficult to initially understand what they are discussing). I think what many of the writers fail to realize is that each object should be a story. Instead they have different area where there are stories about the artifacts (I think. I haven't looked into that part).
So far this is my favorite one http://www.scp-wiki.net/scp-093 It works well because written as a dry report then you go to the "tests" which are short stories that slowly reveal the nature of object and keeps the reader interested. The final part is the "recovered materials" which has the big reveal at the end. The story could use some polish, but is pretty good.
Compare it to this: http://www.scp-wiki.net/scp-173 Which is the highest rated article. It's just a description of a strange and creepy artifact ( a weird concrete monster). Perhaps someone has written a story about it, but it's not linked to that page. I'm not saying the author should reveal everything about it, but it needs a narrative.
Well anyway, that's my two cents. People who are fans of "weird fiction" like Borges, House of Leaves, or the works of China Melville might like it as would plain old horror fans. Peruse at your leisure.
Huh. I thought this would get at least one comment. Maybe from Syt or someone like that.
I actually had a look. It's an interesting concept. :)