OPTasks is a Task list (or Todo list) for PocketPC. It is compatible with the windows mobile bundled software (pocket outlook), but it is different because: It is more flexible.
It is designed to have the most used functions only a click away. The task list can hold more tasks in a single screen because of smaller font.
Same for categories, and the list is scrollable. Icons on the menu bar, double click and tap-and-hold menu. Most operations can be done with just one hand.