Things for iPad 1.0
the author of this app says:
Things is a beautifully focused and amazingly intuitive task manager. Other todo applications either oversimplify or are too difficult to use. Things instead offers the perfect balance between ease of use and powerful features.
Effortlessly manage to-dos, notes, due dates, and projects. A smart today list and the scheduling feature allow you to work as effectively as possible - every day.
Requires iPhone OS 3.2 or later.