I almost donated bone marrow to this old lady but she died before the took it.
This is another area when faith becomes a problem. here in Israel about 10% of the population will not donate organs because their rabbis say it is forbidden, and to top it all they are allowed to receive donations. so you get absurd situations like this one
http://www.ynet.co.il/articles/0,7340,L-3961475,00.html
(use google translate or something, its in Hebrew)
when a woman says that even though she just received a lung that saved her life she will declare her self as an organ donor( in Israel one can carry a card that states if and what organs one is willing do donate, although family consent is still needed)
i personaly think it should be mandetory to donate blood and , port mortem of course ,organs.
after all we are all worm food