I think it's a good resource for pointing people to; it would be a pity if LW reaction was dominated by nit-picks.
Unfortunately one is talking about a series of ideas that can already easily trigger weirdness heuristics and feelings of crankiness whether or not they exist. Every little feature that reinforces that (such as typos, references to undefined terms, etc.) will make that worse, possibly at a very rapid rate.
existential-risk.org
(Updated 2011-12-16 due to a comment by Nick Bostrom.)
'Existential Risk FAQ' by Nick Bostrom
(2011) Version 1.0
Link: pdf html
'Existential Risk Prevention as the Most Important Task for Humanity' by Nick Bostrom
(2011) Working paper (revised)
Link: pdf html