I love sticky notes, and Post-It knows sticky notes.  They've been a hit since they hit the market, and they've only gotten better over the years. 

 Super-sticky notes are a must have for certain situations.   While the original Post-It notes are great for sticking to a lot of things, they have a tendency to come un-stuck from things like computer monitors (which ironically is where many office workers want to stick them) or lightly textured items.  They also tend to come un-stuck if they are up for a while or get pulled off and put back up a few times.  I use them for temporary notes stuck...