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 read nearly everything on less wrong but except for a couple months last summer, I generally don't comment because a) I feel I don't have time, b) my perfectionist standards make me anxious about meeting and maintaining the high standards of discussion here and c) very often someone has either already said what I would have wanted to say or I anticipate from experience that someone will very soon.
Even if you know someone else is going to say it soon, do so yourself and you'll still get some of the credit.