There is a good collection of photos of the scrap WTC steel here:

http://www.amny.com/news/local/groundzero/...gallery?index=1

There are 59 images, and it may be worth backing these up. The captions state that this is Hangar 17 at Kennedy Int'l Airport.

Here is another collection claimed to have been taken at Ground Zero on Sept. 15, 2001.

http://home.hiwaay.net/~langford/wtc/

These would also be worth archiving.

Here is an NBC Brian Williams video about the debris in Hangar 17:

9/11: Remains of the day
In a hangar at JFK, World Trade Center artifacts are treated as sacred

http://www.msnbc.msn.com/id/14789146/