Fans of ABC's coffee klatch The View got a major jolt this morning when co-host Lisa Ling announced that she's quitting the show after three years. Ling is leaving to take a job as an international reporter for National Geographic Television. "If I don't do it now, I may never do it," the 29-year-old told viewers. Her last day is Dec. 5. Producers are holding off on naming a replacement. Instead, celeb guests will fill the slot during the coming months.