I recently took another look at
http://trust.cse.ucsc.edu/WikiTrust and think it could be helpful at CZ in several ways, though I have no idea whether it needs to be adjusted to work with subpages. Specifically, it helps to:
*provide some measure of trust to non-approved articles (could become valuable for controversial topics, as it highlights what editors agree upon);
*provide a measure of trust into the edits by an author (beyond real-world credentials);
*find out who wrote which word in any given article (a feature I always wanted, as it may sometimes be easier to ask that person rather than musing about her reasons for that particular phrasing).
As WikiTrust comes in two major flavours (one for real-time use, one for use on a dump), I would suggest to take a look at the second one first and see whether this is helpful. What do you think?