Network plugin 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.
Enables ajax searches for content. The default settings work automatically with Twentyten and derivatives.
Contributor: edward mindreantre
Tracks all logins and login attempt on a blog or network.
A WordPress plugin to merge and compress the CSS and JS links on the page.
Display upcoming posts in a widget.
WP / network plugin to display admin news to other users.
WP / WPMU plugin to display different global messages in the admin panel according to user role. Like the "premium" plugin but better.