a controversial question?

It seems that one of my previous posts has sparked a bit of a controversy, and I thought I might expand on that a bit more. I'd like to know how each of you feels about invitro fertilization and other infertility treatments that help infertile couples become pregnant. Are they just another advance in medical science, a gray area in regards to medical ethics, or a downright sin?

Tell me your thoughts... and I'll leave my thoughts in a few days!