Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.
Hi.
I've been lurking here and on OB for a couple of years. As other people have said, there seems to be a large amount of prerequisite knowledge required to post here. I usually find my own thoughts expressed more clearly by someone else in the comments, so I up-vote rather than just adding noise.