Running multiple instances of the same proggie is a bit yesterday. IIRC the main 'killer' feature of Firefox was its tabbed browsing.
Dragging things around with a mouse is a good way to lose them - particularly between program instances, you have the problem of the source stealing focus and hiding the target when you start dragging stuff.
With a dual pane interface you could copy (or move) a book to the other library by clicking a button, or by using the context menu, or by doing as I do in my dual pane file damager - F5 to copy, F6 to move current item(s).
BR
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