Sticky Notifications plays well with OS X, nerds

If you want a quick way to create simple, visual reminders on your Mac, Sticky Notifications might be up your alley.
Among Sticky Notifications’ tricks is a System Service so you can use a keyboard shortcut, Automator support, and even a URL scheme that you can use with productivity utilities like Alfred and LaunchBar.

Sticky Notifications is just $3 in the Mac App Store.