Hands Working Together
Many tasks are most naturally done with both hands working together. Why should working on a computer be any different? Rotate a shape with two touches in a drawing application. Or move two pictures at once to get your page layout just right.

Be In Two Places At One Time
Alternating between your hands is just as valuable as using both at once. You can have one hand near a tool palette, the other near your document and switch between them nearly instantaneously. You’ll spend more time working and less time getting around.

Don’t Forget The Fingers
Once you’re free to use your whole hand, you’ll find it natural to use many of your fingers. Imagine the fluidity of touch typing, but with your hands over a graphical interface instead of the keyboard.