Developed in partnership between Incsub and Ring of Blogs, This is a most excellent widget as it allows your users to use up to 9 Widgetbox widgets in their sidebars... just drop it into mu-plugins and watch as your blogs start to become populated with Tetris, PacMan, radio stations and glittertext :)
Grab it here: http://wpmudevorg.wordpress.com/project/Widgetbox-Widget