Hollywood's major studios are taking the battle to stop Internet movie piracy to a whole new level beginning this week with a high-priced series of public service announcements in some of the nation's most influential newspapers and magazines. "Parental Guidance Suggested: Illegal downloading inappropriate for all ages," the ads blare in the New York Times, Washington Post, Los Angeles Times and other papers and magazines, including 100 college newspapers. The question is, will the ad campaign make a difference and save filmmakers millions in lost revenue from illegal downloads by mostly young, Internet-savvy users? "We wouldn't be spending several million...