@Razzleg,
Thanks, I asked mainly because of all the detractors of Utilitarianism I've seen complaining that it allows for disastrous results, like the one I mentioned. My reaction has always been "haven't they heard of the 'Harm Principle'?"
In my opinion the Harm Principle is a nice bulwark to prevent such misapplications of classic Utilitarianism. So whenever I speak of Utilitarianism I'm actually referring to Mill's version, but since his HP appeared in "On Liberty" rather than his essay, "Utilitarianism", I wondered if that allowed some to not consider it part of his version of the theory.