It's amazing what kind of passion competition can unleash, even stupid ones, like American Idol.
I have been sucked into one, and made this video to help bolster my campaign. If you feel like enabling me in this insanity: http://www.jonnygoldstein.com/2008/04/03/vote-jonny-now/ I guess the relevant thing for this list, is for folks interested in creating engagement in their video efforts, competition can be one method. It has certainly sucked me in.