Your video may be used as part of a public service announcement (be prepared to be asked for your autograph by adoring fans)!
When you are shooting, try to keep your screen size at its highest: 1920x1080 or 1280x720. Keep graphics and your main content/subject on the center of the screen. Save an original master copy of your video on a data DVD or thumb drive. If you are a winner, we will need this from you so go ahead and do it on the front end.
Tip from Vimeo.com:
"Typically, resolution is expressed as image length (in pixels) times height (also in pixels). So if you read that a camera records video at 1280 by 720, what that means is it records a rectangular image that is 1,280 pixels wide and 720 pixels tall. Let's review a few common resolutions that you'll encounter with online video. There's 640x480, commonly referred to as standard definition (or SD). Then there’s 1280x720, which is the minimum for what's called high definition (or HD). And finally there’s 1920x1080, which is sometimes referred to as full HD. (Keep in mind that all of these terms are relative, and that as technology marches on HD will include higher and higher resolutions. So don’t get too attached to these numbers.)