"The key to good writing is not that magical glass of Bordeaux, the right kind of tobacco or that groovy background music. The key is focus."
iA recently launched the excellent iPad app Writer. No autocorrection, no scroll bars, and no cut and paste. Just you and the text. A Focus Mode blurs out everything except the current three lines of text you are working on.
The monospaced font Nitti Light, created and optimized for iPad by Bold Monday, text size, column width, leading and contrast are carefully set for the best reading experience both in portrait and landscape mode.