Comedians for whom Oprah Winfrey jokes are a staple can breathe a sigh of relief today. The omnipotent talk-show host has renewed her TV contract through 2011, ensuring that her chatfest, a 38-time Emmy winner, will reach its 25th anniversary in syndication. And they said it wouldn't last. No, wait — it was her relationship with Stedman that they said wouldn't last.