"I've been looking for an app like this since my Palm days". otterman, review from the App Store.
Magic Reminder helps to form new habits and achieve your goals by sending reminders about them throughout the day when you—with work and worries occupying your thoughts—forget about them.
You don't have to set up the exact times of reminders; they come periodically at random times until you stop them. You just need to choose optimal frequency.
Over time, you’ll get used to remembering the meaning of the reminder each time you really need it, and you won’t need reminders anymore.
Featured by Apple in the "What's Hot" and "New and Noteworthy" Productivity App Section