REFLECTLY - The world's first intelligent journal
Future Me - Send an email to your future self
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.
Letter to Yourself - Send a physical letter to your future self
Grid Diary - The simplest way to get started with keeping a diary
Dabble Me - Your own private place to write. A journal/diary to help you remember what's happened in your life.