Wordpress Comments built with Yahoo UI

Jack Slocum has just created an incredible comment system for Wordpress. The demo lets you add comments to any block in the post just by clicking in the left margin.
Yellow tags show the number of comments for that block of text, just click the tag to view the comments.
What is really nice is that the comments are posted via Ajax and do not require a page load. This makes the system very responsive and a pleasure to use.
Jack admits it still needs some work (he only started it yesterday), but I have a feeling we’ll be seeing many blogs migrating their comments to this system very very soon.