I received a pack of these Post-it flags at a conference I attended several months ago. I took them with me to choir practice to use for marking music. I always have trouble turning pages while performing so I had the idea to put one of these on each page, staggering the placement so that I could grab the top one for the very next page, then the next one down for the next page turn, until the end of the song. This works so well that I also used it on a speech, except this way I don't have to turn the page, I just slide it across the podium, using the flag to grab the page I am finished using for notes and go to the next page.
The flags are easy to grab and can be used several times for these purposes!