The comments at the bottom of this page are stored on the Talis platform (in the Sandbox Store) as RDF, using the SIOC ontology, and retrieved with JSONP, with the RDF converted into RDF/JSON by the experimental Talis Convert service.
The Plugin uses jQuery and the Talis.jQuery plugin.
Paste this html into the page section you want to allow comments on:
<div class="sioc-has_reply"></div>
<script type="text/javascript"
charset="utf-8"
src="http://n2.talis.com/svn/playground/kwijibo/javascript/sioc-comments/bundle.js">
</script>
See The N2 blog post for further details