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If you spend a lot of time working with PIM data, contacts, calendar, tasks, and notes, then Pocket Informant is for you. The app aggregates all of those functions into one place and can sync with a wide variety of online networks.
The app is fully customizable, almost dauntingly so, to make all of the standard data views just right. In addition to calendar, contacts, and task views, Pocket Informant has a useful Today view that aggregates onto one screen all information that is pertinent for the current day.