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Featured WPMU DEV projects:
Farms 100 big ones theme pack - the latest theme pack has 100 delicious, 100% WPMU compatible, WordPress themes all for you. They are full of widgets (every theme is widgetized) and customizable headers galore.
GT Search All Blogs - Search among posts and pages published in your wpmu installation, results are ordered by the most recent to the oldest post/page, you can decide how many results you want to show per page, it’s easy to translate in your language (the default language in English)
WPMU for Dummies: Part Deux - an mu-plugin to enhance the SiteAdmin–>Admin(wpmu-admin.php) page.
Menus - If, like me, you need to hide the Themes Menu, or don’t want anyone messing with the Permalinks menu, or are frightened by the Delete Blog menu, this plugin will help
Sitewide Comment Tracking Revisited - Useful for tracking comments by community users with output visible in Dashboard–>Comments–>My Comments
Moderate new blogs - New blogs await a final click from a Site Admin to Activate. Keep blog registration enabled and open, keep SiteAdmin email notices enabled, and this keeps new blogs queued in SiteAdmin–>Blogs “Awaiting Moderation”
Sitewide Featured Users Widget - Allows you to simply feature users from across your site via a widget.