This nice animation of the August 21st Eclipse across America showed up on Astronomy Picture of the Day today. It is less than a minute in length and is a good graphic illustration of the path of totality.
The embedded video can be set to full screen for enlargement.
After the video finishes, there is another interesting video follow-up that animates the shadow of the moon as it crosses the country. You can see in detail where totality occurs with the shadow video.