I have recently added a blog to my blogroll on socially responsible investing. This blog "salon" called SRI Notes features contributions by a number of writers, although the lead blogger appears to be a portfolio manager based in Palo Alto, Calfornia named Lloyd Kurtz. A web page under his names connects to the Center for Responsible Business at the University of Calfornia (Berkeley) Hass School of Business.
Both Mr. Kurtz's blog and the Center for Responsible Business feature useful discussions and links to studies on the impact of responsible behaviour on financial performance. For example a recent study out of Erasmus University by a host of professors/students finds that environmental information, as contained in the Innovest environmental rating system, was related to firm financial performance and mattered for firm valuation during the 1996-2002 period.