Boards in Turbulent Times Corporate Governance Report, 2009

Although this report does not offer a particular focus on women, it does offer gender as one unit of analysis/methodology.
 

URL: 
http://www.heidrick.com/NR/rdonlyres/A03A8F3A-A676-43FC-BBBA-06105F43B034/0/CorporateGovernance2009Europe.pdf