hblair: miko, lemme guess, the main reason being to have an organ donor handy?
Not even close. That kind of motivation would be extremely contrary to my philosophy/morality.
I am pretty sure that even most christians - who's philosophy is very conducive to exploitation of children by parents - would not practice cloning for such purposes. Not that I would care to barge into other people's business if they were - as long as they do it with their resources, not mine.
A cloned person might not even look like the person he was cloned from because of blood and nutrient flow during prenatal development.
They will have exactly as much resemblance as natural monozygothic twins - in appearance, physiology, mental abilities and character traits. Not exact match but awfully close.
miko