Does nothing by itself but supplies common code for the <a href="http://rmarsh.com/plugins/similar-posts/">Similar Posts</a>, <a href="http://rmarsh.com/plugins/recent-posts/">Recent Posts</a>, <a href="http://rmarsh.com/plugins/random-posts/">Random Posts</a>, and <a href="http://rmarsh.com/plugins/recent-comments/">Recent Comments</a> plugins. Make sure you have the latest version of this plugin.