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