TurboNote+
This program sits in your tray and allows you to pull up a "sticky note" for reminders, to do lists, shopping lists, alarms and lots more. You can even use hyperlinks to documents you are working on!
You can have the sticky notes appear on your desktop, or you can hide individual ones. You can colour code them. You can send notes to other users.
The program also includes a calendar, a screen capture facility (VERY useful). bulletted lists and check boxes.
I used this program to (amongst other things) put a huge Failure is not an option message in the middle of my computer screen so that I saw it every time I booted up the computer. This program really helped me finish my PhD.

Get it here