I just discovered that the excellent iA Writer app for the iPad is on sale for just $0.99. I’m not sure of just how long this sale will last, so if you are interested in writing on your iPad, you should check it out on the AppStore. This application is a great option for taking notes or working on any text while on the go.
iA Writer has a focus mode which dims out all text outside of a one line radius around the cursor position. This is intended to allow the writer to focus on what he/she is currently writing without the temptation to review other parts of the text. This is one of the apps that I keep on the first page of my iPad and it has served me well so far.