In theory, I think I'd like to be a vegetarian- in practice, I like meat, I don't find anything wrong with that, and at the end of it, I'm just another notch in the foodchain- humans are simply another animal, and it's only natural, as omnivores, to eat other animals. Doesn't mean I don't try to make smart choices in the meat I purchase.
I don't think the act of eating another animal is cruel. Like Shichi said, if I were to go in the wild, a pack of starving lions wouldn't hesitate to eat me.
The lions aren't malicious or cruel, I'm simply a potential meal and they're simply trying to survive.
At any rate, the medication I take was probably tested on animals some point down the line in it's production. The medication my friends take- medications that keeps people alive- was probably tested on animals at some point as well. Where do I draw the line- if I stop eating meat, should I also stop benefiting from other things that are cruel to animals- like the fruits of animal testing? I like to consider myself an animal lover- got my adoption certificates from the WWF and my SPCA calendar on the wall- but things like that have always bugged me.

It's an unforgiving world and I wonder when is the appropriate time to take survival of the fittest to heart.