I'm thinking there was probably some celebration at the word of Hitler's death.
I have so many family and friends who felt the exact same way about the Vietnam war. The sad thing about that was there was never even a real "Mission Accomplished" It should have been a great lesson on the difficulty of guerilla warfare, but sadly it's had some of the same mistakes repeated this time around.
I think with the difference in the type of war we are fighting here Bin Laden's death IS a celebratory marker for some. We never will "win" this war. This is basically an ongoing campaign, similar to the columbian drug trade and our continuing "war" on drugs. It's too nebulous to have a definitive end. In the majority of people's minds this man himself might as well have killed those people that day. He's messianic to his follows, they are an extension of him. When we went to war, his ideology was what we were fighting. So to see him dead, in a lot of folks minds, is the biggest victory we'll get to see for some time.