I just stumbled across a History Channel site about September 11, 2001 – it is a well-designed Flash site that accompanies the video “102 Minutes that Changed America”. (Available on Google Video as well as DVD.)
The interactive Flash mini-site includes videos from 9 amateur and professional filmmakers from around New York City, as well as interviews with them about their experience. It is incredibly powerful, “holy sh*t” footage, for lack of a better term. Parts of the Trinity Church video and 14 Maiden Lane audio are particularly incredible. It will bring you right back to that day, so be sure you have some time to watch before you look at the site.