Less Wrong is extremely intimidating to newcomers and as pointed out by Academian something that would help is a document in FAQ form intended for newcomers. Later we can decide how to best deliver that document to new Less Wrongers, but for now we can edit the existing (narrow) FAQ to make the site less scary and the standards more evident.
Go ahead and make bold edits to the FAQ wiki page or use this post to discuss possible FAQs and answers in agonizing detail.
Just thought I'd jump in to say that, when I was a newcomer, the most confusing thing for me were constant references to AI and FAI. To be honest, I am still left puzzled by such discussions. I would suggest the FAQ contain a brief outline of what FAI is, and if anybody knows a basic-level post about it, I'd be personally obliged.