Lots of research coming out on or related toperinatal mood & anxiety disorders, including studies on the effectiveness of screening for postpartum depression twice during pregnancy, how your personality may impact whether you get PPD, how trained healthcare providers can reduce risk and how web-based support can help women going through the psychological stress of infertility:

From the British Journal of Psychiatry: "Cognitive style, personality and vulnerability to postnatal depression"

From Advances in Psychiatric Treatment: "Risks & case registers in perinatal psychiatry"(no abstract available)

From the American Journal of Obstetrics & Gynecology: "The utility of maternal depression screening in the third trimester"

From BMJ'sEvidence-Based Mental Health: "Health visitor training reduces risk of postnatal depression 6 months after birth"

From Depression & Anxiety: "Effectiveness of therapeutic massage for generalized anxiety disorder: a randomized controlled trial"

From the Archives of Women's Mental Health: "Web-based treatment for infertility-related psychological distress"

Note: Many of these require subscriptions to the publications, which I don't have and you probably don't either. But you can at least read the abstract and get an idea of what the research was about and what the conclusion of the studies were.