Also known as the serial comma.
Are you in favor of using it or not? Regardless of your position, please provide reasoning.
I guess your country of origin may dictate your response to some degree.
My vote: Yea. Why? There are times where it helps to avoid ambiguity. And so to remain consistent, I will always use it even if there is no danger of ambiguity.
[I guess they don't get more OT than this one, eh? So Gio, feel free to delete if you so wish, but please don't bitch about this post if you think it doesn't belong here -- just ignore it in that case as you were already warned that it was waaayy OT]