This is an explanation of NATO, the North Atlantic Treaty Organization and it's history. Focus on the Libya area of the conflict, because that is your topic. 

United Nations: General Assembly - this is a explanation of what the General Assembly does. 

For people in who will be in the G20 - Shadow Banking is one of your topics. 

Good video we can use to explain to new members of what the United Nations is. and what it's use is. (overall), not as much about the single committees but about it's goal as a whole. 

Model UN Conference List - has all the conferences for 2011 and 2012