I realized one day that when rating things (in my case, assigning a rating out of 10 for each anime on my MyAnimeList.net account), it's a lot easier to compare two items at a time rather then trying to figure out where one fits in compared to all the others.  So I made this program that takes a list of items from a file called Input.txt, and uses what is essentially a quicksort, where the user is asked which of two items he prefers for each comparison.  It has saving, too!