Just noticed this new wiki feature today. Broken in Safari at the moment. They must have been adding this as I was trying it, because when I added the link to the wiki on Lou and Peter's book page, the URL wasn't clickable initially. When I revisited the page a short while later, the link was clickable. Strange. Wonder how this will be abused.

I noticed the citations feature today as well. Don't know how long it's been there. These are the citations for Lou and Peter's IA for the WWW book

Talk about feature creep. Amazing how much stuff they're cramming into these pages. Peter pointed out to me that they removed the sidebars, a detail I actually didn't notice before he mentioned it.