Here are the newest additions to The Best Sites To Help Teach About 9/11:
The Wall Street Journal has published three interactives:
Stephane Sednaoui: 9/11 Search and Rescue is an impressive slideshow from TIME.
Reflections on 9/11 is a joint project of The New York Times and YouTube.
911 Materials for Teachers comes from the U.S. Department of Education.
Thinkfinity has many related classroom resources.