:: 2008-09-25 update: i've fixed a lot of things since the .0 releases, so make sure you're using the nightly snapshots for the latest code ::

The ParaChat Drupal module embeds a ParaChat applet in your site and automatically logs in users with their Drupal username. There is access control so you can setup which roles you would like to be able to join the chat room. For added security, you can configure ParaChat to validate users from the ParaChat server before allowing them to join.