I’ve just updated in epel and installed on fedorahosted.org another trac plugin: PeerReviewPlugin
This is a nifty little plugin that lets you do codereviews. You can set users to have CODEREVIEWDEV (developer who can submit reviews) and CODEREVIEWMGR (can approve reviews). You can enable the plugin in the admin section of your trac instance, and should then see a “Peer Review” button.
EDITED TO ADD(2012-01-06): We ran into a problem with the plugin that I missed in my testing of it. ;( I’ve disabled it for now… if anyone has ideas on fixing http://trac-hacks.org/ticket/7034 please chime in there. 😉