Plugin Activation Status is a WordPress plugin by Curtiss Grymala that makes it easier for owners of multisite and multi-network WordPress installations to perform plugin audits on their installations. The plugin generates a list of plugins that are not currently active on any sites or networks. It generates a separate list of plugins that are active somewhere within the installation, and provides details about where and how those plugins are activated.
This plugin first retrieves a full list of all of the plugins that are network-activated throughout your installation. Then, it loops through all of the sites in your installation, retrieving a list of all of the active plugins on each site. Next, it runs a diff between the full list of installed plugins and the list of all active plugins.
Download: http://wordpress.org/extend/plugins/plugin-activation-status/
