According to the site, this compilation contains the full text of the top 100 American political speeches of the 20th century "on the basis of social and political impact, and rhetorical artistry." 67 of the speeches have all or part of the speech available in audio form as well.
While I'm sure there is room for disagreement in the content and order of the speeches, the ones I've listened to so far have been great examples of superb speeches, ones that move people and demonstrate the art of oratory. (Ronald Reagan's address after the Space Shuttle Challenger disaster was particularly moving for me. I remember that day very vividly. The speech got me all choked up again.)
I'd love to be that good some day.