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.
yd-wpmu-bloglist-widgetdirectory and all its contents into the
/wp-content/plugins/directory of your main WPMU site
yd_display_wpmu_bloglist()function. For specific installations, some more information might be found on the YD WPMU Bloglist Widget plugin support page