I don't believe mental events have nonphysical causes, which is precisely why I consider zombies to entail causeless effects.
And yeah, perhaps I'm just reading too much into "metaphysically impossible" as distinct from "impossible"; the truth is I really don't know how to think cogently about what would be impossible if the laws of nature were different.
The "we're all zombies" bit was intended with tongue in cheek; it's actually a direct quote of his from some book or another -- Consciousness Explained, probably -- that I read like 20 years ago and stuck with me. He isn't entirely serious when he says it, of course, and IIRC has a little footnote that says "To quote this phrase out of context would be the height of intellectual dishonesty." or words to that effect.
EDIT: That said, another relevant Dennetism that stuck with me was his response to an undergrad at a seminar I was listening in on years back. The undergrad said, in effect, "But I don't feel like a merely computational process!" and he replied "How do you know? Maybe this is exactly what a merely computational process feels like!"
Despite being (IMO) a philosophy blog, many Less Wrongers tend to disparage mainstream philosophy and emphasize the divergence between our beliefs and theirs. But, how different are we really? My intention with this post is to quantify this difference.
The questions I will post as comments to this article are from the 2009 PhilPapers Survey. If you answer "other" on any of the questions, then please reply to that comment in order to elaborate your answer. Later, I'll post another article comparing the answers I obtain from Less Wrongers with those given by the professional philosophers. This should give us some indication about the differences in belief between Less Wrong and mainstream philosophy.
Glossary
analytic-synthetic distinction, A-theory and B-theory, atheism, compatibilism, consequentialism, contextualism, correspondence theory of truth, deontology, egalitarianism, empiricism, Humeanism, libertarianism, mental content externalism, moral realism, moral motivation internalism and externalism, naturalism, nominalism, Newcomb's problem, physicalism, Platonism, rationalism, relativism, scientific realism, trolley problem, theism, virtue ethics
Note
Thanks pragmatist, for attaching short (mostly accurate) descriptions of the philosophical positions under the poll comments.
Post Script
The polls stopped rendering correctly after the migration to LW 2.0, but the raw data can be found in this repo.