Found floating around on the internet:  How to Care for Introverts: 
  1. Respect their need for privacy
  2. Never embarrass them in public
  3. Let them observe first in new situations.
  4. Give them time to think; don't demand instant answers
  5. Don't interrupt them
  6. Give them advance notice of expected changes in their lives
  7. Give them 15-minute warnings to finish whatever they are doing
  8. Reprimand them privately
  9. Teach them new skills privately
  10. Enable them to find one best friend who has similar interests and abilities
  11. Don't push them to make lots of friends
  12. Respect their introversion; don't try to remake them into extroverts
And of course, the supplement, How to Care for Extroverts: 
  1. Respect their independence
  2. Compliment them in the company of others
  3. Accept and encourage their enthusiasm
  4. Allow them to explore and talk things out
  5. Thoughtfully surprise them
  6. Understand when they are busy
  7. Let them dive right in
  8. Offer them options
  9. Make physical and verbal gestures of affection
  10. Let them shine
Here's a better design of the extrovert one.