There are two very good plugin management tools—Plugin Manager and Plugin Commander. Let's set them up.
Download Plugin Manager from http://wpmudev.org/project/Plugin-Manager and install it to the
wp-content/plugins
directory.Do the same with Plugin Commander, which can be obtained from http://firestats.cc/wiki/WPMUPluginCommander.
Activate the two plugins in your Site Admin panel.
Go to Site Admin | Plugins and click on Check Active Plugins. You should see a list of the plugins your users currently have activated:
Under Site Admin | Plugin Commander you should see a list of all the plug-ins that you currently have installed on your blog:
Click the Auto-activate link to turn on automatic activation of the plugins you would like to have active on all your users' blogs (for example, Bad Behavior and reCAPTCHA).
Click the User control link to enable user activation and deactivation of plugins that you would like to give your users the option to turn...