A new feature in MediaWiki 1.4 is Patrolled edits. After clicking 'diff' on a change in Special:Recentchanges, you may see a link at the bottom, similar to the one below. Patrolled edits are restricted to administrators in most Mediawiki projects.
Patrolling edits is a way to indicate that the edit is beneficial, and to aid collaboration on filtering spam and vandalism. In the recent changes list, if you see an article which is good, you can mark it as "patrolled" so that other users know that it is good and do not necessarily have to re-check it.
In the Recent Changes, an unpatrolled edit looks like this:
While a patrolled one would be like this:
To enable patrolling, add this line to LocalSettings.php:
$wgUseRCPatrol = true;
Note that fresh installs of version 1.4 enable RC Patrol by default.
To enable new page patrol (implemented in 1.12), add this line to LocalSettings.php:
$wgUseNPPatrol = true;
If you don't want users without Administrator access to be able to mark edits as patrolled, add the following line to LocalSettings.php:
$wgOnlySysopsCanPatrol = true;