I'm a fan of making a special post AFTER the OP of a thread that others can edit to their heart's content. I understand that the wikified OP's of threads CAN be reversed to an earlier state in the event someone screws up or goes in and maliciously edits out information, but it's just easier(to me anyway) to keep the first post untouched by anyone other than the OP of a thread.
Personally, I'd love to go back to the old way where there was no editing the OP of a thread unless you were the original poster(or a mod). Too many cooks as they say.