Tomorrow is the last episode of the Oprah Winfrey show on network TV. Oprah will be throwing her considerable energies and resources into her own cable network (OWN: The Oprah Winfrey Network). But she has left a huge footprint on the culture and on the hearts of minds of millions of loyal fans. People have said for years that they wished Oprah were their next door neighbor or their best friend. And for good reason: she is winsome. She is open and transparent. She is incredibly generous. She not only asks the questions you would ask of her guests, she has the power to draw some of the most powerful…