Michael Graziano, in a Huffington Post article today, "Is Spirituality a Byproduct of Evolution?" The article is vague and carefully worded (I think he doesn't want to piss off the faithful) and he misrepresents (accidentally?) the pharyngeal arches in human embryos as "gill slits", but overall, I think that it is an important question to ask (and to get the public talking about).
Spirituality (and its evil child, religion) probably did not evolve specifically for survivability or reproduction; they are probably a misfiring of other neurological processes that are. From what I understand, Michael Shermer's new book, The Believing Brain, delves into this question. I haven't read it yet (no money and it hasn't made its way into my local library) but I am looking forward to it.
If you have any thoughts on the subject, please feel free to pass it along in the comments section or by email.