Since interest in this idea has taken off so much I revised the encouraged commentary script so that it would be more flexible for public use. You can toggle on or off pretty much and of the main features.
I've explained in depth how to get it setup on your blog/website. Encouraged commentary will work in wordpress, textpattern, moveable type, typo, mephisto, drupal, expression engine, etc.. There is no plugin required. You just have to make some minor changes to the HTML markup in your theme or template files. To get started: