A guy whose seemingly awesome works I have only read excerpts of has submitted an article to NYT about vegetarianism. It's called "Against Meat," but its tone is much less strident than its title. It is nice to read and fairly compelling without being stuck-up or aggressive. I heartily recommend it.
But, in case you don't feel like reading it, let me just pull out one quotation. I've heard arguments in this vein, but never put quite so clearly:
"...taste, the crudest of our senses, has been exempted from the ethical rules that govern our other senses. Why? Why doesn’t a horny person have as strong a claim to raping an animal as a hungry one does to confining, killing and eating it? It’s easy to dismiss that question but hard to respond to it. Try to imagine any end other than taste for which it would be justifiable to do what we do to farmed animals."
By the way, I've been eating about 95% vegan-style for the past two weeks (I had some Indian goat cheese on a pizza a while back, and there's milk in the awesome 9-cent chai tea on the street) and am not any scrawnier, weaker, or tired-er than usual. Try it one day a week! I may try to post a recipe or two, like mashed potatoes with tahini or Tzatziki with tofu or birthday treats made from bananas, dates, shaved coconut, palm sugar, cocoa powder, and spices. Not to mention pumpkin and dahl soup. It is indeed possible to be considerate and well-fed at the same time!