This was a sort of interesting, Freudian influenced approach to explaining psychopaths that may resonate with some of you, J. Reid Meloy (author of "The Psychopathic Mind: Origins, Dynamics, and Treatment") with subsequent commentary by Donald Carveth. He is a little bit more on the Hare side of his understanding (i.e. not too sympathetic), but it is a pretty decent overview of some of the more famous studies of sociopaths.