Automatically replicate any plugin setting network-wide: apply sitewide settings. Spread your settings or options on all your multisite blogs. Options
Sidebar widget and template function to display an ordered blog list of subsites (with post count) on a page of the WordPress MU main site.
Add-on to WPML and to WPMU Sitewide tags plugins. Will propagate WPML language properties to the Network wide aggregation blog.