I just added my name to the UK Organ Donor List, so I might be able to help others live after my impending death ^_^
If you've never considered it before, then take a moment. You're dead, you're not going to be missing your squishy bits.
If the idea appeals to you, you can signup
here.
There are further steps you can take if you feel you want to donate bits of yourself while you're still alive, such as liver and bone marrow transplant. Look into it, captain.