Sam Harris is here offering a substantial amount of money to anyone who can show a flaw in the philosophy of 'The Moral Landscape' in 1000 word or less, or at least the best attempt.
http://www.samharris.org/blog/item/the-moral-landscape-challenge1
Up to $20,000 is on offer, although that's only if you change his mind. Whilst we know that this is very difficult, note how few people offer large sums of money for the privelage of being disproven.
In case anyone does win, I will remind you that this site is created and maintained by people who work at MIRI and CFAR, which rely on outside donations, and with whom I am not affiliated.
Note: Is this misplaced in Discussion? I imagine that it could be easily overlooked in an open thread by the sorts of people who would be able to use this information well?
I got that impression as well. And to be honest, I haven't ever seen a good argument for why CEV has any fixed points in morality-space. Or rather, if fixed points exist, it's not immediately obvious to me why two distinct CEV-flows couldn't result in mutually irreconcilable value systems.
Which is why Sam's argument isn't super convincing to me.
Harris's semantics would say that the human CEV is probably good while the alien CEV is something else.
Harris's semantics are actually somewhat similar to Eliezer's, actually.
http://lesswrong.com/lw/fv3/by_which_it_may_be_judged/