I was there, a mile away, downtown. Had I not chosen to drive in that day, I would have been in the PATH station under the towers about when they fell.
Besides the attack itself, the thing I most remember about that day was the media. Every outlet panicked and tried to jump the next with breaking news (at least in NY). I heard radio reports from esteemed outlets with everything from teh Empire State Building to the UN to Lincoln Center being under attack. It was a day of shame for every single reporter, the day they all failed to do their jobs so horribly that the whole world knew it. I have not trusted, watched, or relied upon any news source for accurate information since.