The technology behind cloning is precisely that behind many forms of existing reproductive and genetic technologies, but with a slightly different aim: rather than trying to conceive offspring with some genetic link to the familial parent(s), cloning aims to create an exact genetic duplicate. Such a duplicate could be raised as a child (would we have even more problems with parents trying to vicariously live through their children?). It could also potentially be created for the sole purpose of acting as a dedicated tissue bank. (We are a very long way from the ability to clone specific body parts. Complete organisms are "easier".)
For what purposes do you find human cloning acceptable? What short-term potentially questionable developments would you agree to to achieve desirable long-term goals ( ie. such as cloning of organs)?