If you love to draw, sketch, write (not typing) or color, this Paper app on iOS might be just for you. Brought to you by the people behind the defunct Microsoft Courier project, it seems to be receiving a lot of attention.
The app is already retina display ready. If you are using the new iPad, it should look beautiful. This Paper is free to download. However, you will need to purchase the brushes and etc accessories in-app. The minimum iOS requirement is 4.3. Here is a video to show you the features of the app.
What do you think? I really hope that FiftyThree (the company that develops this app) can continue the Courier project.