I too have a couple of photos I took that beautiful*, awful morning that I never shared online. Nothing that hasn't been seen before, but at the same time they feel very personal. It's not at all surprising to me that people have sat on footage.

* There was nothing beautiful about the attack, obviously, but the day itself was a perfect late summer New York day with a totally cloudless sky. So you'd look in one direction and see smoke and devastation, you'd face the other direction and see nothing but pure crystalline blue skies. It was quite surreal.