Biologos have responded to the NPR program, by suggesting that it is OK to believe in a literal Adam and Eve as theology, even if science is silent on the question. http://biologos.org/blog/nprs-adam-and-eve-story
Darrel Falk and Kathryn Applegate write that “There is no scientific reason to upset that theological apple cart. Indeed as scientists, we must respect the theological diversity of Evangelicalism.” although adding “Science is an amazing tool that gives insight into our world, one which is so effective that it is allows us to become virtually certain about some things.” I would prefer though to maintain a degree of greater scientific scepticism concerning historical questions that are not directly testable, lest we turn our scientific narratives into self delusion. But this approach allows them to hold to science and theology by keeping the questions entirely separate, and I would agree that science cannot determine the outcome of this question, although the suggestion of the existence of Mitochondrial Eve and Y Chromosomal Adam might offer some support.
There are two books in the Baker Book House July 2011 top ten that also address these question http://bbhchurchconnection.wordpress.com/2011/08/02/july-2011-best-sellers/
No. 10 – Should Christians Embrace Evolution? Nevin (ed), IVP – P&R Publ. This book deals with the question and also argues for a literal Adam and Eve – one of the 2011 World Magazine’s book of the Year (the other was Jay Richards (ed) God and Evolution).
No. 8 – Did Adam and Eve Really Exist? C.J.Collins, Crossway – again the author of this book wishes to mantain a commitment to a literal Adam and Eve even if the Genesis story is to be read as literature and not literal history.