Machines (more) like us

If we aren't exactly machines, could machines be more like us? Having written about the necessity of emotion for thought a couple of times, a post from Luciano Floridi about a forthcoming book on sociable robotics grabbed my attention for his unexpected pairing of two words. If emotion is required for thought, if knowing is a matter of biology, how might synthetic emotion be created? I really hadn't thought of it that way before.