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A to-do list that reminds you of tasks can be quite useful for today's busy lifestyle. Taskulous for iPhone/iPod (free) provides a simple but very practical to-do list with a lot of features. It provides one-touch access to add new entry. You can either just put in a simple name of the task/event and save it or add details such as text notes, due date, reminder time, repeat intervals and so on. The app also allows you to inform anyone about a task via email. As you add a task, it appears in a list with a check box next to it. Once the task is done, simply tap on the box and it will grey out with a check in the box - indicating that the task is complete. The app even displays reminder alerts on the home screen - a very helpful feature.