Serge at the Imago Dei blog take the time to respond to Boyd's initial exchange with David from Jivin Jehoshaphat on abortion: Abortion, Brain Death, and Very Poor Thinking. It is an excellent response.
Meanwhile, the next round of the dialogue between Jivin and Boyd continues here.
And as long as your at the Jivin J blog, you might want to check out his series on How Pro-Choicers Argue (Intro, Part One, Part Two, Part Three, Part Four, Part Five, Part Six)