YouTube.com

Though it debuted only five months ago, YouTube.com attracts 6 million visitors each day to watch two-minute video clips that amount to the Internet's version of "America's Funniest Home Videos" meets "American Idol." Every day, users stock the site with 35,000 homemade videos of lip-syncing, dancing, silly animation and commentaries on any topic, all of which are commented on and rated by viewers.