Inappropriate.
Not to sound like an insensitive prick, but I don't think anyone will ever forget September 11th, and the events surrounding. Why would you... how could you even contemplate something of such audacity as to suggest that we have forgotten something of such significance and such publicity?
Yes, we all mourn for those that were lost, but the real challenge is to push forward, celebrate their lives, and to carry on in a way that shows we have not, will not, give in to violence.
This is just a slideshow to an audio track; you did no work of you own aside from importing the files and arranging them, with very little text.
As I see this as nothing more than you trying to get sympathy points from the newgrounds audience, you get a zero.