I'm not sure if I count as a lurker...
I comment enough that I can top-level, but all of my comments come in relatively short spurts of activity interspaced by much longer periods of inactivity (say a day or two of activity per 1 or 2 months). Perhaps a good standard would be to go up to a randomly selected group of readers and ask if they know me by my screen name. Last time I checked this the answer was no, so I guess I'll call myself a lurker, but if anyone objects, I won't say boo.
Anyway, hi!
The definition is not very important, but I don't think you count as a lurker. Lurking is more like total non-participation, not occasionally participating. You're also probably above the median for karma on Less Wrong.
Anyways, all are welcome in this thread.
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.