It might be a good idea to formalize our process for reviewing code changes. Right now it's done primarily unstructured e-mails. Using an on-line tool will help us facilitate working with more developers.
Codestriker is one free possibility that we could start adapting today.
Review Board looks very promising but hasn't made its first official release yet. The code is only available from their Subversion repository.
Review board (or rather the Django framework it is built on) seems to require Apache 2 and mod_python 3 (see "Deploying Django"). To run it on pub.vestasys.org we would need to upgrade. (MoinMoinPackages/DebianLinux suggest that this wiki should work fine with Apache 2, but we should make sure to understand the implications of it and test it on this wiki before upgrading.) It can apparently also be run in a standalone mode where it is its own web server. This doesn't perform as well as using Apache and mod_python, but might be good enough for our curent needs.
Google Mondiran might be interesting, but it's not clear whether it's going to be freely available
JCR looks like another free option
Of course with any of these tools we would need to do some work to interface them with the Vesta repository.