I'm sure you all heard Obama's speech today. It's was pretty good in my opinion. So here's another one. FDR's speech from 1933. You've heard the soundbite of "The only thing we have to fear, is fear itself". But the whole speech is very good, addressing the economic crisis of his time.
Things get a little strange at the end, where he says that if Congress doesn't act, then he'll ask for "supreme executive power" to give him the same authority he'd have if we were at war. We saw what an unchecked Executive branch got us and it wasn't good. But the speech is great otherwise.