Siggy has a good write up on remembering 9/11 here and here. As usual, I agree with most, but not all of it. That is one of the great things about America. Usually, even with the bitterest of disagreements, it is a peaceful disagreement.
For me, I spent 9/11 doing one of the most American of activities - Baseball. Yankees vs. Red Sox. It was nice because there is no politics involved. We sat next to my friends father who is an Israeli immigrant. No discussions of the Gaza pullout, just about when the pitcher should be pulled. No one in the crowd cared who held the Ohio 2nd congressional seat, just about who was on 2nd base.
That night, from my balcony, I could see the two beams of light that reached into the sky from the footprints of the twin towers. It was somber to say the least. But, I also realized that they reached into the sky about as far as our potential reaches... In other words, beyond our own vision.