I read that book, too. Very interesting material.
My wife is a 2x heart transplant recipient in her 20s, so I know what a huge impact organ donation can have. The most important thing is to educate your family and let them know your wishes, because generally it's their decision when the time comes. You receive the exact same medical treatment and it doesn't cost you or your family anything (sorry if it's condescending to say, but those are two issues I hear about often).
Thanks Cerb for the plug!