Some sites should have a designated notice that states what the security is for the site, and lists the responsible person to notify in case there are content errors. Using SP Sticky Notes creates a consistent interface for placing this key information on the page.
Also find it very useful for adding to a page that contains workflows to explain to users how to use it!
StickyNote is a simple but useful app to bring sticky notes to your SharePoint Site. You can put small colorful reminders on a white wall and its a fantastic way to present notes on a page.