Yes, I am. The reason for this is because I personally think that anyone who isn't an organ donor is simply lazy, or selfish. Note that when I say selfish I mean the people who outright refuse to do so, not the people who simply can't be bothered. Thing is, if any of us on this forum were suddenly involved in a serious accident tomorrow, maybe being run down by a car or something, and we needed an emergency organ transplant or blood transfusion, we wouldn't be complaining that there are people out there who have, dead or alive, donated organs for them to use. Likewise if one of us was suddenly struck down with a serious illness and was put on the waiting list for a new organ, or else we'd die. We wouldn't be complaining about organ donors, in fact we'd be sitting there praying to whatever deity we believe in, or to Richard Dawkins, that someone will donate their organ (regardless of the way in which said organ becomes available) so we can live.
Therefore, it's downright selfish to expect an organ for you when you need one, yet not be prepared to donate to someone else who is in vital need of one when they are ill or injured and we can afford to donate. As for when we die, we don't need the organs anymore, so why not let them be of use to someone else who needs them? I'm not entirely sure how many people can be saved individually from a single person's organs and blood, but I'm pretty sure that the answer is at least ten, probably more, per person. When I die, as an organ donor, I could potentially save over ten people's lives. How good is that? It's a damn sight better than letting those ten or more people die because I was too selfish or lazy to bother signing up as a donor.
And that is also why I personally feel that the law should be changed so that everyone is an organ donor by default. If you don't want to be one, then fine, you're being a heartless bastard but nevertheless an opt-out scheme should be available. But everyone should automatically be made a donor as soon as they reach the age of, say, 18, and then have to register to opt-out of the donor list if they have any reason for not wanting to be a donor, such as religious reasons or something. We'd have much shorter waiting lists, save thousands more lives, and it would be so much less strain on the healthcare services. Not to mention solving the problem of apathy with regards to organ donors.