Pro-Life activist Dr. Janet Smith debated the dissenter Dr. Charles Curran in front of a packed Dallas audience in 1994. I think the debate is well worth a focused listening because Dr. Smith and Dr. Curran are widely recognized as the top proponents of their respective positions on the contraception issue (at least in the US), and it's a rare occurrence indeed to hear two figures of their stature debating each other live.
[Listen to Part One of the debate] [Listen to Part Two of the debate]
*Via American Papist