Simple Ajax Shoutbox (simple-ajax-shoutbox) free WordPress plugin

This plugin will add a shoutbox on your sidebar. Using AJAX technology so visitor doesnt have to refresh page to view their messages. It automatically reload every few seconds so you can see other visitor messages live. It has simple design, so it will blend to your current theme whatever it is. No extra graphics, color, text. Just a simple box. Support smilies, smilies tags are instantly converted to graphics smilies.