With Side note, you can simply create multiple notes. Here, tucked discreetly Side note on the right or left edge desktop and only appears when you move your mouse over the corresponding location. If you want to use permanently Side note, can you look at it on the screen “Pin”and it is permanently visible.
The different notes can be reached easily via a drop-down menu.
Sidenote requires at least Mac OS X 10.4
Version: Sidenote 1.7.3