At first, I thought that this was for developing productivity habits.

http://lifehacker.com/281626/jerry-seinfelds-productivity-se...

I used to like putting stickers on a calendar as a kid for this sort of thing, and I wanted to do that on the phone but found that most electronic calendars aren't so good for that. So I developed an app to let me do that. http://www.ooghamist.com/shinycal/