Yep. ;p It's even a mitzvah.
As I understand it, organ donation is a mitzvah in the case above, as the kidney donation was not harming the donor and saving the life of a recipient. In the case of organ harvesting (before death, but when death is imminent) it can only be in response to an immediate need (i.e. skin or eye "banking" is a no-no). Lots of halachic law to wade through. What is the otherstanding of others?