WPMS Network Global Inserts allow wordpress multisite network admin to insert html in the content accross the network
The Windspeed Converter gives you the possibility to insert a converter via widget or shortcode into your site.
Broadcast MU is a plugin for WordPress which allows you to broadcast a post to one or more other blogs on the same installation of WordPress.
With This Plugin You Can Add Your Advertisement In WordPress Network Blogs
Plugin Commander is a plugin management plugin for multi-site mode, which allows further control on network-activated plugins.