Here are some useful resources regarding UN peacekeeping and sexual exploitation and abuse:
From the UN
UN peacekeeping - the UN's relaunched official site with new sexual exploitation and abuse section
UN Conduct and discipline - a UN site that lists all allegations of sexual exploitation and abuse, and the status of investigations. Contains many UN stats
Making sense of the missing links - a briefing paper for the LSE Centre for Women Peace and Security by Jasmine-Kim Westendorf. Summarises reform efforts to date and why what is needed is a human rights and judicial approach
Dealing with Disgrace - a report by Jeni Whelan for IPI on how resolution 2272 can be turned into a plan for action