Apple iBook (Original) - Manual (Page 28)

Keyboard and trackpad
When you use the keyboard and trackpad, your shoulders should be
relaxed. Your upper arm and forearm should form an angle that is
slightly greater than a right angle, with your wrist and hand in roughly
a straight line.
Use a light touch when typing or using the trackpad and keep
your hands and fingers relaxed. Avoid rolling your thumbs under
your palms.
Change hand positions often to avoid fatigue. Some computer users
may develop discomfort in their hands, wrists, or arms after intensive
work without breaks. If you begin to develop chronic pain or
discomfort in your hands, wrists, or arms, consult a qualified
health specialist.
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How do I work comfortably?