Not yet but soon.
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Android Will Soon Allow Screenshots Without the Painful Setup [Updates]
It's not available on actual phones yet, but a core code change in Android 2.3.3 allows for apps to take screenshots, without "rooting" or setting up a development kit. Yes, iPhone users have been able to do this for some time, and, yes, it should have been available earlier. But, hey, it's a major pain that's going away. [Android Central]
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