I just started watching online but last week, there was a debate done on Nightline between Christians and non-Christians about whether or not Satan exists. Pastor Mark Driscoll of Mars Hill Church started right out of the chute with the Gospel - clearly stated. There are 10 videos total that I want to watch later - and then I want to watch the first "Faceoff" that Nightline did with Kirk Cameron debating "The Existence of God". That's also at the Nightline site.
See the videos here.