Specifically in his comments like how he has his reply and it does the ajax drop down to comment on the other comment and the Gravatar.com "How do I change my avatar?" box. See example: http://www.shoemoney.com/2008/09/16/what-is-a-super-affiliate/#comments Is that custom design or is it a plugin? If it's a plugin does anyone know which ones?
The comment plugin is called Wordpress Thread Comment 1.4.7.8 available at: wordpress.org/extend/plugins/wordpress-thread-comment/ I looked at the source code for the page.