-Can there be morality without god?
-Doesn't natural selection show that altruism is impossible?
-And my personal favorite for now is this (paraphrasing) response from an evolutionary psychologist to a philosopher on a video blog:
“Psychologists aren't concerned with the truth. We just want an accurate description of how the mind works.”
-Everything is just a state of mind.
-Also see the idiotic comments on the comments section of the New York Times' The Stone to these three articles (here, here and here).