Link:
http://www.j-fx.ws/tagbox/
Info:
tagBox is a free simple tagger/shoutbox script written in PHP.
It uses a text file to store posts so it doesn't require any MySQL database. This database is protected with simple encryption and an htaccess file. The script is made to be easily customized and has many options and features such as html limitation, smileys, flood protection, an admin panel with post editing and deletion, word bans, ip bans, timestamps, users online, clickable smileys, and more.
It runs perfectly on PHP4 and PHP5, linux and windows servers!
Best of all: It's completely free!
Example Sites:
http://www.rm249.com/