Luca De Alfaro is a researcher who has been working on an awesome new MediaWiki extension: Wikitrust. Wikitrust is a coloring system for text on a MediaWiki website that uses a computed trust metric for authors to color the words on a page depending on how reliable they are computed to be. The words of a well-trusted author appear white, the words of an untrusted trouble-maker are shown in bright orange. Everybody else is colored somewhere in the middle of the scale. In Wikitrust, there would be a "Trust" tab at the top of every page that you could click on to see what parts of the page are the most stable, and which are most suspicious.
He announced the V2.0 of his extension on wikiquality-l last week, and we've been discussing it ever since. He was looking for some place to install and test it that wouldn't be too big (because we need to evaluate server-load before we install it on en.wikipedia), but would be bigger then a small test wiki. I, of course, nominated en.wikibooks for the honor, and I think there is a little bit of support for that on the list. It's one more item in the queue of desired features, behind flaggedrevs and a few other home-brew extensions we've been clamoring for.