Yahoo kicked off NewFront week in NYC today by stepping up its effort to blur, if not erase, the line befween online and TV programming. It unveiled 18 series, including a Simon Cowell-produced DJ talent show, a daily news show hosted by Katie Couric, a live weekly business news show, and magazine-related series including one featuring model Naomi Campbell and another with actress Michelle Rodriguez. "We know that advertisers want to tap into premium video content that…