Has television come full circle? Oprah Winfrey has her own radio station over on Sirius XM Radio (of course she does). But starting September 14, you'll be able to catch repeats of The Oprah Winfrey Show on Winfrey's Harpo Radio the day after they air on television. She also plans to air classic episodes from her 20 year run on the radio network.

We've seen radio talk shows, like Howard Stern, Bob & Tom and even Rush Limbaugh, come to television, but this may be the first time the reverse has happened. Certainly it's the first time for Oprah's show. It's an interesting experiment. Satellite radio, like cable television, offers the chance for radio to expand beyond the expectations of over-the-air radio.

That means, radio can explore the world it used to dominate before television took over. Back then, most of our favorite programs were radio programs. Oprah's talk show is a good fit for the audio environment, as you generally don't need to see what she's talking about to get it. But could you imagine our dramas or comedies on the radio?