WordPress.org

Author: zhiqiang

Features:

• very easy to use, just download it, upload it, activate it, done.
• send comments in Ajax
• reply others' comments
• AJAX preview comments
• show limited number of comments per page.
• Gravatar is integrally supported.
• delete/spamed/edit comment when administrator are reading posts
• Administrator can send notification if he want when reply a comment.
• and more

See http://zhiqiang.org/blog/ for a demo.

Notice:

• This plugin might be conflict with some other plugins with the same features like "QUOTER", "THRESHOLD" and "AJAX COMMENT". Please deactivate the others if you want to use this one.
• The 1.0 version is by http://blog.nahoya.com/archives/2006_04/109