She didn't do just one - she did two! She did one and it was so popular that she did a follow up show a week after the first. They were both great!

About the second show, this is what it says on the Oprah message boards:

On February 8, 2007, millions tuned in to The Oprah Winfrey Show to learn the mystery of The Secret. Since the show aired, our message boards have been buzzing with people who want to know more. The Secret is defined as the law of attraction, which states that like attracts like. The concept says that the energy you put into the world—both good and bad—is exactly what comes back to you. This means you create the circumstances of your life with the choices you make every day.