Here is a basic outline of the ideas illustrated:
1. Distinguish between document title and application titles and make the document title more prominent
2. Eliminate distinction between window backgroundand window title bar - Window background is click-and-drag-able everywhere that is not a control
3. Large, click-able/drag-able document icon that can be dragged to the trash to delete, dragged to the desktop and other locations to save, etc.
4. All controls and elements sit on the window "pane", always leaving click-and-drag-able area for moving, and always leaving clickable borders for window resizing
5. Window resize gripper is always available to provide a large, easily clickable window resizing area