I think more people should look into this and other donations.. I've donated a kidney and am on the Bone Marrow Donor registry (http://bethematch.org/
The three times I've cried in my life: Wedding day, birth of child, and walking to meet my kidney recipient after the operation.
I went through the Transplant Facility at MUSC (Medical University of South Carolina). The operations, while major, are somewhat common and straight forward. I never doubted anything would go wrong, and to be honest, I'd do it again... This is not to say that it wasn't painless. Day one, it felt like I was hit by a bus; day two felt like I was kit by a car; day three I don;t remember... (lots of morphine); day four I was home. It took about 8 weeks before I really felt like myself again. Well worth a summer vacation... You want to pick up chicks, drop the info that you donated a kidney....
I'm actually surprised that there isn't a Be The Match program for Kidney donations as there is for Bone Marrow. (Maybe there is and I am unaware--just did a google search... egads.)
Anyway, if you don;t want to donate while you're alive; sign up to do it afterward when you aren't using the organs any more.