kanedo

This widget displays all comments on all blogs on your multi site wordpress installation. You can define how many comments should be displayed.

Get All Comments Widget

Creates a widget which lists all comments across all sites of a multi site wordpress installation

Marcus (aka @msykes)

=THIS PLUGIN IS ONLY USEFUL IF YOU’RE USING MULTI-SITE MODE=
This is the same plugin previously available at <a href="http://firestats.cc/wiki/WPMUPluginCommander" rel="nofollow ugc">http://firestats.cc/wiki/WPMUPluginCommander</a>, which has been used reliably with wordpress multi-site networks for many years.
Plugin Commander is a plugin management plugin for multi-site mode, which allows further control on network-activated plugins.
It allow you to do the following things:
<ul>
<li>Mark any plugin in the plugins directory to be automatically activated for new blogs.</li>
<li>Mass activate or deactivate a plugin for all existing blogs</li>
<li>Choose which plugins users can activate and deactivate through Manage->Plugins, for this to make sense you need to disable the built-in plugins menu (through Site Admin->Options->Menus)</li>
<li>Activate and deactivate plugins for specific blogs, even if the blog owner is not allowed to control those plugins.</li>
</ul>

Plugin Commander

Plugin Commander is a plugin management plugin for multi-site mode, which allows further control on network-activated plugins.

Get All Comments Widget vs Plugin Commander