Disqus, pronounced "discuss", is a service and tool for web comments and discussions. The Disqus comment system can be plugged into any website, blog, or application that makes commenting easier and more interactive. Disqus offers advanced comment features for Blogger, TypePad, Moveable Type, WordPress and other platforms. Features like avatar support, threaded comments, and the ability to rank other users comments.
Disqus released an update for WordPress plugin that includes trackback/pingback and pagination support as well as a couple of minor bug fixes.