Salon has a full-length but poorer quality video
up as well.
And, of course, a torrent of a high-quality video.
Seriously, if you don't understand why this speech is so important, I'll bet you have a "W '04" sticker on your vehicle.
UPDATE: YouTube has removed the video's at the request of C-SPAN.
UPDATE the second: It's now up on Google Video, this time with C-SPAN's permission.