Hi Mike,
I have downloaded almost 10 PostIt programs and picked out two after testing them all. One is StickIt and one is Memento. StickIt is actually the more Powerfull (but still small) application and looks better, but it has - for me - a great drawback, and that is the way you edit the notes. In Memento you just click into the note and write or delete something. That is not much more effort than put it down on a real paper postit, but clicking the menu-button of StickIt note and then draging the mouse to another window and click on OK at the end for any small new note is a bit too time-consuming for me. It would be great, if you implement a DirectEdit feature.
Thanks
Mubed