New answers tagged drag-n-drop
Use vertical parallel lines when dragging horizontally and viceversa. Update: as per new information the items are draggable horizontally and vertically. In this case a grid of dots will convey better the idea of dragging in any direction, like this screen shot http://dribbble.com/shots/1041938-Draggable-Fields-Rebound
Drag and drop has a usability issue where it is a non-obvious feature (how users suppose to know you can drag items?), more so if the drop target is not the same as the source. The principle solution for this is to include 'assists' - show labels revealing what can be dragged and where. In your case, you can add under the menus heading "drop pages here to ...
If possible, I would add a short but concise explanation at the top of the page explaining the process. Additionally, or instead of, that depends on you, I would allow a free dragging of the object, but if the mouse crosses the vertical line separating both areas, I'd make a message appear telling the user that a copy is being generated and that the ...
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