Plugin Commander
Plugin Commander is a plugin management plugin for WPMU. It allow you to do the following things:
- Mark any plugin in the plugins directory to be automatically activated for new blogs.
- Mass activate or deactivate a plugin for all existing blogs
- NEW: 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.
Download from here.
To install copy into mu-plugins