I watched this on PBS the past two weeks. It's 4 hours total, and shows the personal history of these two men (complete with some well done reenactment) and how they came to their beliefs interspersed with a panel of people with different beliefs (believers and nonbelievers) talking about a lot of the basic issues with religion and Christianity. The panel includes a Dr. from Harvard, the editor of Skeptic magazine, and some other really interesting people.
As is to be expected (hey, it's PBS :) The Question of God is very well done. Extremely fascinating, and it makes you think. I was so impressed by it that I'm seriously considering buying it. I'm also going to read C.S. Lewis' Mere Christianity.