Like many of the apps that I wrote about last year in preparation for NaNoWriMo, My Writing Nook is best for producing large quantities of text without worrying about formatting. The interface is spare, and for situations where you're just concerned about committing as many words as possible to virtual paper, that's what many writers want.
In the standard writing mode, you are typing onto a blank sheet of cream-colored paper. There's also a "dark and stormy night" mode which presents you with white letters on a black background. The settings also provide nine different fonts in a variety of sizes. Auto-correct and spell checking are turned on by default, and a real-time word count can be enabled with a single finger swipe. If you'd like the kids to stay out of your Great American Novel, you can password-protect your work.