WPMU LinkManager is a WordPress plugin by wpler that manages your Themes footer links for every blog into a multisite includes with conditional tags.
With this plugin you can manage your outgoing links into the themes by a shortcode/function for every blog. You can set for every link the target, relation (Attribute rel), linktext and -title and the target url. Also you can set more than one link for a blog.
For output you can use a shortcode or a function . This function get the links for the current blog-id and printed this, if links are available.
All options/links can set by network admin only.
Download: http://wordpress.org/extend/plugins/wpmu-linkmanager/