I'm probably the odd-lady out here, but I am NOT a donor. I have done numerous procurements in the OR, taking organs from a brain dead person to get them to someone in need. Although I realize that it's a noble thing to do, I just can't agree to being the one on the table.
I've had several friends that had donations, and they didn't have a huge improvement in quality of life, simple a couple more years.
I'n not afraid of dying, but I prefer quality to quantity. I would support my children's decisions if they wanted to be a donor, but it's not for me.