President Obama is the 2009 winner of the Nobel Peace Prize for "extraordinary efforts to strengthen international diplomacy and cooperation between peoples." The decision appeared to catch observers by surprise.

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World leaders past and present react to word of President Obama's Nobel
How it's awarded
Norwegian lawmakers, aided by expert advisers, choose Nobel Peace Prize winners
Tweets not sweet Sarcasm seemed to be the overwhelming reaction on Twitter
Obama a unique winner
In winning the Nobel Peace Prize, Obama joins an elite group of U.S. presidents
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Timeline: Past laureates
Take a look back at some former recipients of the Nobel Peace Prize
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What do you think? Does Obama deserve the 2009 Nobel Peace Prize? Put your thoughts on video.
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