'Civil Rights March on Washington, D.C. [Leaders of the march posing in front of the statue of Abraham Lincoln, Lincoln Memorial.], 08/28/1963' photo (c) 1963, The U.S. National Archives - license: http://www.flickr.com/commons/usage/

Here are some more excellent additions to The Best Resources About The March On Washington:

Witnesses to History, 50 Years Later is a great interactive from The New York Times.

“Did You Know?” Myths and Facts About the 1963 March on Washington for Jobs and Freedom is from Teaching For Change.

What Do Asian-Americans Owe The Civil Rights Movement? is from NPR.

PBS has additional multimedia resources.

President Obama has made some comments on the March’s anniversary.

The National Education Association has a lot of resources.