Sign of the times -- read the full (BusinessWeek) article for an overview of how some players are attempting to automate the task.
As Viacom's (VIA ) $1 billion copyright-infringement lawsuit against Google (GOOG ) and YouTube grinds through the courts, another drama is unfolding behind the scenes. In a cramped office in New York's Times Square, dozens of twentysomethings work day and night scouring YouTube for Viacom TV shows and movies that have been uploaded by just about anybody. For each clip deemed stolen, Viacom's team sends out a "takedown" notice requiring YouTube to remove it immediately. Back in San Bruno, Calif., a crew of young YouTubers finds the specified clips and pulls them.
Source: The YouTube Police