Hey there LW!
At least 6 months ago, I stumbled upon a PDF of the sequences (or at least Map and Territory) while randomly browsing a website hosting various PDF ebooks. I read "The Simple Truth" and "What do we mean by Rationality?", but somehow lost the link to the file at some stage. I recalled the name of the website it mentioned (obviously LessWrong) from somewhere, and started trying to find it. After not too long, I came to Methods of Rationality (which a friend of mine had previously linked via Facebook) and began reading, but I forgot about it too after not too long. At some stage about 4 months ago I re-discovered MoR, read about 3/4 of what was available and then started reading LessWrong itself.
It took me about 3 days to get my head around the introduction to Bayes' Theorem (since implementing a basic Bayesian categorisation algorithm), and in the process I realised just how flawed my reasoning potentially was, and found out just how rational one friend of mine in particular was (very). By that stage, I was hooked and have been reading the sequences quite frequently since, finally making an account at here today. There's still plenty more reading to be done though!
A little background (and slight egotism alert, which could probably be applied to everything here); I'm in my final year of school now, vice-captain of the school's robotics program (and the programmer of Australia's champion school-age competitive robot), debating coach to various grades and I've completed a university level "Introduction to Software Engineering" in Python using Tkinter for GUI stuff as I finished the Maths B course a year early. I'm planning to go into university for a Bachelor of Science/Bachelor of Engineering majoring in Mathematics/Software Engineering next year. I've got major side interests in philosophy and psychology which I currently don't plan to explore in any formal sort of way, but LessWrong provides an outlet that addresses with these two.
I look forward to future comments and whatever criticism they attract; learning from mistakes tends to stick rather well.
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Once a post gets over 500 comments, the site stops showing them all by default. If this post has 500 comments and you have 20 karma, please do start the next welcome post; a new post is a good perennial way to encourage newcomers and lurkers to introduce themselves. (Step-by-step, foolproof instructions here; takes <180seconds.)
If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post.
Finally, a big thank you to everyone that helped write this post via its predecessors!