I think different intelligent entities will have different values, but that it's objectively possible to determine what these are and what actions are correct for which ones. I also think most people's stated values are only an approximation of their actual values.
"Objective" means "mind-independent" so if you're looking at someone's mind to determine those values they're, by definition, subjective. When we use the words "objective" and "subjective" in meta-ethics we're almost always using them in this way and now questioning, say, whether or not there are objective facts about other people's minds.
Do you believe in an objective morality capable of being scientifically investigated (a la Sam Harris *or others*), or are you a moral nihilist/relativist? There seems to be some division on this point. I would have thought Less Wrong to be well in the former camp.
Edit: There seems to be some confusion - when I say "an objective morality capable of being scientifically investigated (a la Sam Harris *or others*)" - I do NOT mean something like a "one true, universal, metaphysical morality for all mind-designs" like the Socratic/Platonic Form of Good or any such nonsense. I just mean something in reality that's mind-independent - in the sense that it is hard-wired, e.g. by evolution, and thus independent/prior to any later knowledge or cognitive content - and thus can be investigated scientifically. It is a definite "is" from which we can make true "ought" statements relative to that "is". See drethelin's comment and my analysis of Clippy.