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I would like to know the purpose of the LEDs on top of the Arduino WiFi Shield: L9/Link/Error/Data (left in the picture). What do they indicate?

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The web page on the Arduino site for the board tells you in plain words what they mean:

On board indicators The shield contains a number of informational LEDs:

  • L9 (yellow) : this is tied to digital pin 9
  • LINK (green) : indicates a connection to a network
  • ERROR (red) : indicates when there is a communication error
  • DATA (blue) : indicates data being transmitted/received
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