Found this through IMAO:

CNN.com - AFI top 100 to show the money quotes - Nov 17, 2004

Here's the link to a pdf file of all 400 nominees. I haven't looked through the whole thing, of course, but it's fun to read. Particularly because of all the quotes I recognize from movies I've never seen. I also think it's amusing to see how often I don't know a character's name, even though I've seen the movie more than once.

UPDATE - Black Bart made the list: "'Scuse me while I whip this out!"