Sidecomments is a project mainly written in PHP and JAVASCRIPT, based on the GPL-2.0 license.
WP subtheme of twenty-ten shifting comments
Sidecomments is a child theme of twentyten. Designed for shorter posts/questions and responses, it moves the comments to the sidebar, provides a breadcrumb trail as you move deeper into the comment thread, and shows dialogs for comments higher in the thread.
LICENSE: GPL
USAGE:
Install the theme as usual. Make sure that threaded comments is checked in the comment settings.