The UK's Human Fertilisation and Embryology Authority (HFEA) has already approved research that would involve human cloning for non-reproductive purposes. Recently, according to The Register, an application that builds on that one was accepted, in which researchers will attempt to create an embryo that contains DNA from not one, not two, but three different people.
Turns out some diseases, such as muscular dystrophy, are triggered by defective genes in the maternal mitochondrial (extra-nuclear) DNA. By transplanting the healthy nucleus into a new, healthy egg, researchers hope they can eliminate these diseases--while still maintaining the "real parenthood" of good old Mom and Dad.
Missing in the dicsussion is the question, where in the world will all these eggs come from?