they gave me a keyring for my epicness. Seriously I got up to 10 donations...haven't done in it in the past 18 months or so but now i'm fit as a fiddle again and getting back into it soon
it's ostensibly for altruistic reasons but it makes me feel good about myself so it's more a selfish self gratifying thing :P
I started giving blood about 9 months ago. Can only give it every 3 months in Oz, so I have done it 3 times now. Dont get any money for doing it, but the satisfaction is enough knowing I might save someones life!