Case 1 :
While "sticky notes" are certainly one of the all time great ideas of our time , they have several severe limitation. You have a limited amount of text space , they can't be easily changed,
you can't have pictures, etc.
Solution : By using a QRnotes label instead of a "sticky note", or even a QRnotes label ON a "sticky note" you can eliminate the weaknesses of a sticky note and make the note MUCH more powerful.
Results : QR "sticky" notes have more uses and are more powerful than "paper sticky notes".