PDAs, or personal digital assistants, are great tools for keeping our busy lives organized. In addition to the basic functionality you'll find on all PDAs (calendar, tasks, contacts, notes), many PDAs let you install additional software, or applications, for even greater organizational functionality. Here's a look at some popular organizational apps for your iPod Touch, iPhone, and iPad.
This personal task manager provides a simple user interface and works with the GTD (Getting Things Done) method.
reQall lets you dictate your to-dos, reminders, appointments and other notes and it will translate your commands into text. A free and a more feature-filled paid version of this app are available.