The banlist now uses a new plugin, again made by the one and only devicenull. This plugin checks with the server everytime a user connects. If the user is banned, it brings up a full web page explaining the situation, rather than a small message box.
This is what someone who is banned sees when they connect.
I'll let the old plugin continue to run for awhile longer while server admins migrate over to the new one.
Read this page to see how to install the new plugin.