For anyone wondering how this turned out, I haven't bought meat at the grocery store in the last two and a half months. I still order meat at restaurants.
My original analysis still holds. I just don't care (in the aggregate) about the life of one or two or ten animals. I don't think my marginal impact as a fair weather vegetarian is meaningful. Regardless, I have lost much of my taste for meat. I still have a lot of meat sitting in my freezer.
I have noticed that among philosophers, vegetarianism of one form or another is quite common. In fact, I became a vegetarian (technically a pescetarian) myself partly out of respect for an undergraduate philosophy professor. I am interested in finding out if there is a similar disproportion in the Less Wrong community.
I didn't request that this go into Yvain's survey because I want more information than just what animal products you do or don't eat; I'd also like to see nuances of the reasons behind your diet. There are a lot more shades than carnivore/vegetarian/vegan - if you want to be a vegetarian but are allergic to soy and gluten, that's a compelling reason to diversify protein sources, for instance. I'd also like to hear about if you avoid any plant foods (if you think they're farmed in a way that's environmentally destructive or that hurts people or if you have warm fuzzy feelings for plants, maybe). Here are some questions that come to mind: