Like it or not, UN PKOs remain a significant part of the global architecture for peace and security, and it might be useful to think how they might be better used or made more effective.
-Clearly articulated and understood mission
-Clearly articulated rules of engagement and rules for use of force
-Concurrence among donor countries on how the job will be done, when a unified HQ and C2 structure is employed (think the nightmare of UNOSOM)
-Transparency
-Relevant training
-Instilling a strong commitment to employ force, within the known constraints, to do the job, as opposed to dithering around about what to do in the face of bullies who attempt to exploit perceived weakness in resolve
-Troops who are less in it for the food-on-my-table-at-home aspect. I know, nearly impossible to do,but it should be an objective nonetheless
-Clearly articulated and understood mission ( It all comes back down to this)

I've studied peacemaking/peacekeeping seriously ever since I served in Somalia, and wouldn't mind serving on observer duty at some point.