If you haven't seen it already, check out the mirror neuron forum recently published online in Perspectives in Psychological Science. Organized by Art Glenberg, the forum includes answers to ALL the important questions regarding mirror neurons from a group of scientists who represent a range of perspectives on the issues. Authors include Gallese, Gernsbacher, Heyes, Hickok, and Iacoboni. The best part of the forum, though, is that each author wrote responses to the other authors' answers, providing for some interesting discussion.
The mirror neuron forum can be found here.
I'd love to hear your thoughts on the discussion.