I'm surprised there isn't more activity in this thread. Anyway, watched the third episode last night and I am starting to suspect that Dexter was misdiagnosed by the doctor when he was a kid.
The shrink keeps marveling at how he is able to have such an emotional range for a psychopath and how unusual it is. She calls him a psychopath so frequently it's almost like she's trying to convince herself that he is one when in fact he may not be.
I wouldn't be surprised if the series winds up with Dexter discovering that he isn't a true psychopath and could have avoided his whole lifestyle if he hadn't been diagnosed as a psychopath and had instead been given proper treatment as a child. I can envision a scenario where Vogel is his last kill and he does it because she is the cause of so many deaths. I also wouldn't be surprised if Dexter was not Vogel's first foray into creating a functional psychopath.
Of course I could be totally off base here, but I'm enjoying what I'm seeing so far. I'm looking forward to see how it all (shrink)wraps up!