Network plugin for PHP v5.4 to broadcast posts to other blogs. Custom post types, custom taxonomies, post meta and attachments are supported.
A mailing list deamon that reflects email from an IMAP account to readers.
Track and display site or network-wide user activity.
WP / WPMU plugin to display different global messages in the admin panel according to user role. Like the "premium" plugin but better.
RSS link for this tag.