Mac: When a distraction takes you away from your desk, it's easy to forget what you were doing before the interruption. Sticky Notifications is an app that lets you quickly jot down a note and send it over to Notification Center or Growl so you don't forget to finish what you started.
Unlike Mac OS X's built-in sticky notes or a to-do list, Sticky Notifications is all about the instant reminder. You can access it from the menubar or with a quick keyboard shortcut. Its purpose isn't to store a list of notes or reminders -- it's to provide a simple way to keep track of what you need to remember right now. When you add a note, it stays pinned to the Notification Center until you close it.
You can check out Sticky Notifications for free or download the full version for $US3 from the developer's site linked below.