WordPress MU

Alexking.org has done a excellent plugin for wordpress blog.

This plugin allows you to easily present a list of posts you select outside of your blog chronology. Very useful for featuring things that might otherwise slip into the nether regions of your archives.

This plugin has modified for WPMU, you may download here.
http://mu.bloggles.info/2006/12/25/share-this-wpmu-edition/

a mofified version of the original plugin is also available here: http://dev.lipidity.com/feature/wp-plugin-gregarious

seems to work from the plugin folder.