Obama wins Nobel Peace Prize -- why?

In a surprising move, the Norwegian Nobel Committee has awarded the Nobel Peace Prize for 2009 to United States President Barack Obama, "for his extraordinary efforts to strengthen international diplomacy and cooperation between peoples. The Committee has attached special importance to Obama's vision of and work for a world without nuclear weapons."

While the committee further adds that "Obama has as President created a new climate in international politics," many raised their eyebrows when they heard of the decision, going as far as to call it a mistake and premature. Obama has been in office less than a year. In fact, he took office less than two weeks before the February 1 nomination deadline. Some question the grounds for the award, saying that while his words certainly resonate in the context of the Nobel Peace Prize, what has he actually achieved?