Check out the new UN Secretary-General's Database on Violence Against Women launched March 2009.
"The primary source of information for the database is the responses received from Member States to the questionnaire on violence against women, of September 2008, and subsequent updates. Other sources of information include:

* States parties' reports to human rights treaty bodies
* Information provided by Member States in follow-up to the Fourth World Conference on Women (1995); for reports of the Secretary-General; and in statements made at the United Nations
* Information available through relevant United Nations entities"