The "Yes We Can" fever

I am very confused about the Obama's influence on everything. The guy has been just awarded the 2009 Nobel prize for peace just by having some intentions, or by thinking.
The Nobel Committee said he won it for "his extraordinary efforts to strengthen international diplomacy and co-operation between peoples".
Come on, did that happen before in the Nobel prizes? what are the achievements?
Maybe because the US policy was directed to invading countries and many countries were on the list. But this is silly really thought.
Why everybody is impressed and binding hope on Obama? I remember now the propaganda made for his visit to Cairo to give a speech to the islamic world. While I was feeling that this speech won't have any impact on anything in the world- except traffic jams in Cairo for some few days for security reasons- ppl were really trying to pay attention to the words thrown as if Obama was going to give hints about his future plans during his speech. The speech was something like say everything about everything, so that ppl looking or sthg will find it, and will be happy. Everyone is pleased hearing Obama.
Well, I hope that I am wrong, and Obama will show he deserves this prize. We will see anyway.