If you have a Nintendo 3DS, are in North America (or maybe just the United States, I'm not sure), and want to vote for your favorite video that was on Nintendo Video, call 1-877-752-9866.
I just called and it was a pre-recorded message where it listed some videos and you pressed the corresponding number to vote for that video.
Videos will be released every 2 hours through Nintendo Video until 2:00 am EST on January 2.