Wow! Cool thread man. My mom has to get a bonemarrow transplant in 13 days. Lucky for her she has two options she can be her own donor or a sibling can be a donor. She has 3 other siblings so she should be just fine, but other people who are an only child and can't use themselves as a donor could really need your help.
From what my moms doc told her, her sisters only need to have blood drawn as its the bloopers stem cells they need. So it might be like donating blood for some.