After 25 years coming into our living rooms and sharing her life and the lives of those around her, Oprah is calling it quits today. The final show was taped yesterday and show guests say it was just "Oprah on stage" with a chair - although she didn't use it much. Oprah used the opportunity to share one more time, what she has learned the past quarter of a century.  Others may try, but no one will ever replace Oprah