To get things started, here's one that I like:

A Content-Driven Reputation System for the Wikipedia

http://www2007.org/program/paper.php?id=692

http://www.soe.ucsc.edu/~luca/papers/07/wikiwww2007.ps

http://www.cse.ucsc.edu/~luca/papers/06/ucsc-crl-06-18.pdf