I've been meaning to link to Russell Davies' site for sometime, but I've been waiting for him to write something worth repeating. Well, I got bored waiting and settled for this instead!
Actually, its a brilliant idea, a planning wiki.
I always see these wikis as being a little bit like creches - somewhere to leave the nippers safe in the knowledge that high walls and strong locks will keep them in and everyone else out. And so you get these amazing micrcosoms full of happy, sad, shouty, quiet people all playing the same game but all playing in slightly different ways. And if there are any tantrums, well, they're only kids!