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Do not conform to MacOS X user interface standard: no drag&drop to organize the pages or add a file, even in the merge function you must do all using dialogs and inserting pages numbers instead of viewing the pages that you are moving/merging.
It looks like a Windows App, not a MacOS App!
I'm not trying to be ironic, but I truly would like to know what could be the difference between the (apparently similar) functions of Proview PDF Editor and the ones already built-in on the preview.app of Snow Leopard.