I may be reading into his post, but it sounds like he wants a list of people that are currently online (?).
If so, Thomas Klaiber’s Simple Onlinelist plugin gives you a template tag (
<?php show_online_users(); ?>) that you can drop in anywhere to generate a simple list showing users currently online.
You could modify the plugin to display some kind of message, an image, part of their profile. Anything you want to keep cold, Tommy Boy.