If you ever need to write something down so you don't forget or if you are board and your want something to this app is what you need.
Lets say you are sitting in a waiting room and you are board. You can pull out your iPod Touch or iPhone and start to draw.
You can also use this app to quiz yourself. Say you are learning Spanish, you can just write down the regular word and the spanish word then cover the spanish or regular word over and see if you can guess what it means in the other language.
It is also great for you if you have a kid that needs some entertainment. Just open the app and let them draw away. It will give them hours of entertainment.