Disable anonymous edits in MediaWiki
Using a MediaWiki installation to document internal systems where i'm currently at, and although we all have users it's easy to forget to login before making edits. This results in a history full of IP addresses rather than names, which is a bit less useful. So, to prevent us from forgetting to login we decided to force ourselves to log in by disabling anonymous edits. You do that by adding the following to your LocalSettings.php.
$wgGroupPermissions['*']['edit'] = false;