Growl notifications when a user logs in to Minecraft server?

Would love to be able to get a Growl notification when a user logs in to my (locally hosted) Minecraft server. I took a peek in the Console but it doesn't seem to record the logins, although my server GUI shows activity on the server including logins. It runs within Java, so maybe that's the issue with it not showing up in the Console, although some of my actions do seem to get recorded, but those seem related to the main Minecraft app and not the server. Even if I could find the logs, I am at a loss as to how one sets up a Growl notification, although I assume it has to do with growlNotify: http://growl.info/extras.php#growlnotify