From Igor Vigdorchik:
The Sticky Notes application allows you to create electronic sticky notes directly on your Windows desktop. The Sticky Notes are just like paper sticky notes for your computer. Jot down tasks, messages, ideas, appointments, phone numbers, birthdays in a note and stick it on the desktop. A note can be positioned anywhere you wish, or hidden in your task bar, then searched and displayed later. Notes can be re-sized. The note's contents can be formatted to include fonts, colors, transparency and hyperlinks. Also notes have a click thru capability. Once on screen, notes will remain where placed until closed, even through reboots. Alarms can be added to a note to act as a reminder. Sticky Notes application is small and simple and all notes are kept in one text file.
Sticky Notes doesn't require any installation process or additional components and it does not use the registry. Download the zip file and create a new folder in C:\Program Files and name it 'StickyNotes'. Extract the contents of the downloaded file to C:\Program Files\StickyNotes. Click on the StickyNotes.exe. Sticky Notes icon will appear in the Windows System Tray (bottom corner to the right of the Windows taskbar). To start up Sticky Notes every time Windows boots up, add Sticky Notes to your Start-up group. To do this click the button "Create a shortcut in the start-up group" in the Options dialog
To open a new sticky note, double click on the Sticky Notes icon in the system tray/notification area. To access the application menu, right click on the Sticky Notes tray icon. To access the note menu, click on the down arrow in the upper left hand corner. By default, Sticky Notes will stay on top of other windows as indicated by the pin. To toggle that setting, click on the pin once. To close a sticky note, click on the small red power button in the upper right hand corner. Sticky Note saves all of your sticky notes in a .dat file, so don't worry if you closed a sticky note accidentally, you can always retrieve using the Search window.