J. Scott Applewhite / Associated Press
September: Sarah Palin's Web Explosion.
When John McCain announced his surprise candidate, the governor of Alaska, he couldn't have known that he was igniting one of the biggest media frenzies of the election. Palin lit up the Web in a way few subjects have, dominating the home pages and popularity lists of just about every news and culture website. The Web seems exceedingly quiet without her.