I found it ... Shawn McCraney. This program aired Jan 8, 2007. Shawn is quite knowledgeable. They are taking phone calls in the portion now on.
Of course, this interview only scratches the surface. Tanner's been studying Mormon history and doctrine for 47 years.
Her website, Utah Lighthouse Ministry, is crammed with information. Just click on her homepage links to "topical index" or the mind-blowing "online resources" link.
This lady is a powerhouse!