i was in high school the first time i heard the word "euthanasia", and went to the library (card catalogs, anyone?) to read up on it. i immediately knew i was in favor of it, especially for myself. As Andrew said, why is it that we're more likely to make sure our animals don't suffer than we are ourselves and the people we love? i know much of it is emotion and selfishness, but for me, i truly do not want to be hanging on for no reason what-so-ever.
i took a
thanatology course in college, and during that time we had to make out our dying wishes as well as what we wanted to happen as far as a funeral/celebration of life, and what we wanted to happen to our remains. i still have all that info in my filing cabinet and everyone close to me knows about it (i've also given copies to several people). i have a living will and a DNR, along with my organ/body donation info.
Quality over quantity, for me.