The developers at Mibbit.com have created a very nice (AJAX) widget that gives your community members access to IRC channels via a window (iFramed widget) on one of your site's pages.
This module makes it easy for administrators to add the IRC widget to their Drupal sites.
Now Supports Other IRC Servers
See this page for a list of supported servers: http://wiki.mibbit.com/index.php/ServerList
Mibbit IRC is sponsored by WebWise Solutions.