(I wrote this on the 11th and forgot to post it.)
I just read Tyler Green’s first post on 9/11 and art. When I think of 9/11 related art, I think of Thomas Ruff’s exhibition in March/April 2005 at David Zwirner. In that exhibition there were two images of the WTC on fire taken from the internet and made into large photographs. Of the two, Ruff’s jpeg ny02 from 2004 is the most memorable.
(today)
The show was simultaneous with Robert Gober’s exhibition at Matthew Marks that Paul Schimmel mentioned in a subsequent post on MAN.

Thomas Ruff, jpeg ny02, C-Print with Diasec
Image Size: Framed: 105.91 x 143.31 inches, 2004