From LifeType Wiki
Download link: http://sourceforge.net/projects/lifetype/files/
Author: The LifeType Project
This plugin will mark all new comments as "Unmoderated" and therefore they will not be published until they are approved by the blog owner.
The plugin configuration page can be found under Control Center->Anti Spam Management.
There is no need to make any changes to the templates in order to get this plugin to work. If anything, you might want to include a notice informing your readers that comments will not appear inmediately.