Religious Attitudes to Organ Donation

One thing I've recently been thinking about is organ procurement, and in particular possible objections to an opt-out (or 'presumed consent') system. It's often suggested that this may violate the conscience of certain religious groups, e.g. because they think their bodies must be buried whole if they are to have an afterlife. It's pleasing to see that a variety of UK religious leaders consider organ donation a moral duty.