Android: Taking Screenshot

Question:
How do I take screenshot on a Android device?

Answer:
Android 4.0 (Ice Cream Sandwich) or above:
 - Hold down the volume down and power button at the same time

Kindle Fire:
 - Hold down the volume down and power button at the same time

HTC devices:
 - Hold down the power button, then press Home

If you are a developer and have the Android SDK installed, you can use DDMS