This National Archives (UK National Archives) site has some great stuff for the Cuban Missile Crisis. I know you are months away from the topic but the 50th anniversary is this month. My colleague, Jeff Feinstein sent me the link with this description.
It lets students learn about the background to the crisis, the key players and the issues. Students learn by studying primary sources arranged around four organizing questions:
1. What triggered the Cuban missile crisis?
2. Why didn't the Cuban missile crisis lead to nuclear war?
3. Did international relations improve?
4. How does Kennedy's death affect our view of him?