Justinthecanuck started us on this discussion some time ago, but he has been busy with other commitments. The following article from The Stanford Encyclopedia of Philosophy presents a thorough review of the topic.
Experimental moral philosophy began to emerge as a methodology in the last decade of the twentieth century, a branch of the larger experimental philosophy (X-Phi, XΦ) approach. From the beginning, it has been embroiled in controversy on a number of fronts. Some doubt that it is philosophy at all. Others acknowledge that it is philosophy but think that it has produced modest results at best and confusion at worst. Still others think it represents an important advance.