The Creator view is used to create new objects in the currently loaded Zone.
The Layer view shows the different layers in the Zone. I'll provide a better explanation of how Layers work in a bit, but the Default Layer works the way you'd expect most world builders to work.
You have a tree-view of Groups and Game Objects (this screen shot only shows the Root Group, but imagine having other groups and game objects below it).
When you select an object in the Creator view and then right-click in the Zone view (black area which is not quite hooked up yet), you can add that object to the zone and it will add it to the currently selected Group in the currently selected Layer.
Also, notice the WillowTree has a element named "creatorCategory". This is a "/" separated path of where the game object should appear in the Creator view. If the GOT does not have a value for creatorCategory, it won't show up in the Creator (which means it cannot be created, which is valid for some game objects like Skills, Spells, etc).
I'm short on time right now but I'll provide more updates soon... next time we'll hopefully see a game object actually created and visible in the Zone view.
Enjoy
