Here are a few recent reports on corporate social responsibility that I haven't had time to go through yet - just wanted to get all the links in one place...
The biggest recent news, of course, is the Social Investment Forum's Trends Report, which came out January 26th. This report gives a sense of how much money is manged according to social constraints in the U.S.
In October 2005, the international law firm Freshfields Bruckhaus Deringer issued a report for the UN Environment Programme (UNEP) Finance Initiative entitled "A legal framework for the integration of environmental, social, and governance issues into institutional investment". It reviews the legal basis for social investing in the U.S., Canada, Japan, and western Europe. (Thanks to Glynn Washington at the Council for Responsible Public Investment for telling me about this one.) You can find a copy of the report here.
McKinsey and Company's nonprofit practice has had a series of recent articles on social responsibility, including one on the UN Global compact. You can review the whole list here (registration required).