Daily Minded - The easy way to maintain a journal, diary or captain's log.
Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
Mini Diary - Simple and secure journal app
Grid Diary - The simplest way to get started with keeping a diary
tinythoughts - Keeping a journal is hard. tinythoughts makes it easy.
Punkt - Private & secure one-sentence journaling