There has been a great deal of information and research produced on the advantages of gender specific education in recent years. The links and references here are only a beginning, but represent a good start on recent thinking.
World Wide Web
Evidence Regarding Single Sex Education
Evidence on Developmental Brain Research
Evidence on Gender Difference in Learning
Articles
Brain Differences in Boys and Girls
Books
Why Gender Matters by Leonard Sax
Boys and Girls Learn Differently: A Guide for Teachers and Parents by Michael Gurian
The Minds of Boys: Saving Our Sons From Falling Behind in School and Life by Michael Gurian
The Boys and Girls Learn Differently Action Guide for Teachers by Michael Gurian
Same, Different, Equal: Rethinking Single-Sex Schooling by Rosemary C. Salomone
Raising Cain: Protecting the Emotional Life of Boys by Dan Kindlon
The Wonder of Boys by Michael Gurian
The Wonder of Girls : Understanding the Hidden Nature of Our Daughters by Michael Gurian
Girls Will Be Girls: Raising Confident and Courageous Daughters by JoAnn Deak
The Good Son: Shaping the Moral Development of Our Boys and Young Men by Michael Gurian