This is a speech that will be remembered.
Edit (20 Mar 2008): Apparently others think so too.
Has any major U.S. politician in modern times ever given a speech about race in America as unflinching, human and ultimately hopeful as the one Barack Obama delivered yesterday? Whether or not the speech satisfies critics of Mr. Obama’s close relationship with the Rev. Jeremiah Wright, this remarkable address was one for the history books.
(Editorial: The Obama speech, Dallas Morning News, Wed., Mar. 19, 2008)
Fanflower's Weblog 
Very powerful stuff. If one thing will ever be said about Barack Obama, it is that he is a very well-grounded and inspirational speaker.