There's a news story on that bothers me quite a bit. There is an organization (I don't think I'll mention it) that offers free membership for organ donation. The catch is that they will only donate organs to other members of the organization. They say that it is similar to a "directed donation" of blood for family members, etc.
I would need to learn more about it before I completely condemn it, but at first blush it sounds rather unethical to me. Donated organs should go to the person who has the direst need and the best tissue match, and that's that. They don't go to the person with the most money, or the person who "knows" somebody, and they shouldn't go to members of an organization. When we die, if we're organ donors (and we all should be!), we don't get to choose the recipients of our organs. It holds the possibility of subtle prejudice, and I think that's an ethical road we don't want to travel.