Some time ago as a Python/Django/JQuery/pywikipedia exercise I've hacked a web based recent changes patrol tool. An alpha version can be seen at the: http://www.wpcvn.com

It includes a few interesting features that may be useful to the community (& researchers designing similar tools):
1. tool uses editors ratings, primarily based on user counters (includes reverted revisions counters) calculated using the wiki dump;
2. site members can see each other reviewing;
3. site members can see edits being reverted (with ratings of the reverting editor);
4. site members can confirm their nicknames (bind to the account on the Wikipedia, the tool can catch/identify a GUID in the edit comment to WP:SANDBOX);
5. can aggregate IRC feeds from bots (currently only MiszaBot is supported).

WPCVN yet another collaborative (it shows other users actions - patrols and reverts) Web 2.0 RC patrol tool that runs in a browser. It has been tested with Firefox, IE and Google Chrome. Currently operates for en-wiki only in the alpha mode. WPCVN aggregates recent changes IRC feed, IRC feed from the MiszaBot and WPCVN user actions. It also uses pre-calculated Wikipedia users "karma" (based on the recent en-wiki dump analysis) to separate edits made by users with clearly good or bad reputation. The tool is open source (LGPL) and uses JQuery/JQueryUI + Django backend.

-- Regards, Dmitry