Haven't done it, but have thought about doing it. Haven't really grabbed the bull by its' horns, i suppose. And also, I'm terrified of needles, they freak me out really bad.
I don't even know what my blood type is, but would like to, actually...
Also, the captcha or whatever it's called said i had to write "Less is more". What the hell, it's gone all philosophical, crazy. But still better than hieroglyphs.