How to take a snapshot on an android device

A number of ways to do this is explained in this reference


for 4.0 and up decice has a way
  (Volume down + power button)
You have to use SDK for prior releases
Manufacturer specific ways may be there.

How to take a snapshot on an android device

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LG Revolution taking a screen shot

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Googling real quick points to apps all the way from free to a 10 bucks. if your phone is not rooted, looks like most of them want you to first connect your device to the pc or mac and set something up and subsequently you can use the app to take pictures.

Or you can just use DDMS from your eclipse plugin if you are a developer.

Here is how to invoke DDMS

Use the camera icon in the DDMS menu (top/left)