It doesn't grant any new abilities as such, admittedly, but if you're interested in making the right decision, then rationality is quite useful; to the extent that choosing correctly can help you, then this is place to be.
Hm. My correction on that would be: To the extent that your native decisionmaking mechanisms are broken and can be fixed by reading blog posts on Less Wrong, then this is the place to be. In other words, how useful the study of rationality is depends on how important and easily beaten the bugs Less Wrong tries to fix in human brains are.
Many people are interested in techniques for becoming more successful and getting more out of life. Techniques range from reading The Secret to doing mindfulness meditation to reading Less Wrong. I don't see any a priori reason to believe that the ROI from reading Less Wrong is substantially higher than other methods. (Though, come to think of it, self-improvement guru Sebastian Marshall gives LW a rave review. So in practice LW might work pretty well, but I don't think that is the sort of thing you can derive from first principles, it's really something that you determine through empirical investigation.)
If you've recently joined the Less Wrong community, please leave a comment here and introduce yourself. We'd love to know who you are, what you're doing, what you value, how you came to identify as a rationalist or how you found us. You can skip right to that if you like; the rest of this post consists of a few things you might find helpful. More can be found at the FAQ.
A few notes about the site mechanics
A few notes about the community
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* Normal_Anomaly
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* Barry Cotter
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.