Scott Aaronson has a new 85 page essay up, titled "The Ghost in the Quantum Turing Machine". (Abstract here.) In Section 2.11 (Singulatarianism) he explicitly mentions Eliezer as an influence. But that's just a starting point, and he then moves in a direction that's very far from any kind of LW consensus. Among other things, he suggests that a crucial qualitative difference between a person and a digital upload is that the laws of physics prohibit making perfect copies of a person. Personally, I find the arguments completely unconvincing, but Aaronson is always thought-provoking and fun to read, and this is a good excuse to read about things like (I quote the abstract) "the No-Cloning Theorem, the measurement problem, decoherence, chaos, the arrow of time, the holographic principle, Newcomb's paradox, Boltzmann brains, algorithmic information theory, and the Common Prior Assumption". This is not just a shopping list of buzzwords, these are all important components of the author's main argument. It unfortunately still seems weak to me, but the time spent reading it is not wasted at all.
"But calling this Knightian unpredictability 'free will' just confuses both issues."
torekp, a quick clarification: I never DO identify Knightian unpredictability with "free will" in the essay. On the contrary, precisely because "free will" has too many overloaded meanings, I make a point of separating out what I'm talking about, and of referring to it as "freedom," "Knightian freedom," or "Knightian unpredictability," but never free will.
On the other hand, I also offer arguments for why I think unpredictability IS at least indirectly relevant to what most people want to know about when they discuss "free will" -- in much the same way that intelligent behavior (e.g., passing the Turing Test) is relevant to what people want to know about when they discuss consciousness. It's not that I'm unaware of the arguments that there's no connection whatsoever between the two; it's just that I disagree with them!
Sorry about misrepresenting you. I should have said "associating it with free will" instead of "calling it free will". I do think the association is a mistake. Admittedly it fits with a long tradition, in theology especially, of seeing freedom of action as being mutually exclusive with causal determination. It's just that the tradition is a mistake. Probably a motivated one (it conveniently gets a deity off the hook for creating and raising such badly behaved "children").