Findings:

• Pending notification of relatives
• system notification area
• Call me a lady and I will growl at you
• Fables from the Book of Yelps and Growls
• Also, when I am angry, my eyes flash fire, whether I growl or not.
• My growl makes an earthquake blush and the thunder ashamed of itself
• I growl at stoplights. Is that weird?
• When I growl, the sound echoes like thunder all through the valleys and woodlands, and children tremble with fear, and women cover their heads with their aprons, and big men run and hide.
• Notification
• Notification of death via email
• growl
• Explicit Congestion Notification
• notification center
• Bookmark Notification (document)
• Notifications (nodelet)

If you Log in you could create a "Growl notification" node. If you don't already have an account, you can register here.