I would set one up, but my experience of doing this in the past, even when it was specifically requested by several people, is that no one contributes.

No one.

More, people not only don't contribute, they don't even adhere to the guidelines that they themselves proposed. As a result I am more than just sceptical about such collaborative efforts, I'm now utterly cynical.

Note: I submitted the link, but I'm not the author.