WPMU MetaTags allows you to control the meta description and meta keywords for the site as well as individual blogs.
Part of the RePublish set of tools for WordPress MU.
Allows blog owner to easily republish content from others blogs in the community through a nice
Allows admin to define a "main blog" and give users permission to republish a post into it with one click as they visit the blogs from the community.
Automagically link Twitterish "@name:" replies in comments.
add ajax-comment functionality to wordpress mu (site-wide)
Restyle your login page with custom CSS.
Edit your robots.txt from within WordPress to control search engine activities.
RSS link for this tag.