Humans have this nasty habit of considering themselves outside of nature. I totally agree with organ donation, but I also believe that cremation is the way to go. Once I die, I'll have my organs donated for those who need them, and I'll have my body cremated and my ashes scattered in a forest or some virgin place of nature. I think that I, as a life-form, can make a final contribution of myself by helping nature by providing nutrients. That way, the human body goes "full-circle" from misc. organic nutrients, to a growing embryo, to a child, to an adult, to a corpse, then back to misc. organic nutrients.