11. A method for displaying a user interface, the method comprising: displaying a first page of a digital book in a first display area and a second page of the digital book in a second display area; receiving a first semantic zoom out request; in response to the first semantic zoom out request, displaying both the first page of the digital book and a context of the first page in the first display area, and displaying both the second page of the digital book and a context of the second page in the second display area; receiving, after receiving the first semantic zoom out request, a second semantic zoom out request; displaying, in response to the second semantic zoom out request, the digital book in the first display area and multiple additional digital books in the second display area; receiving a request to enter a scratchpad mode, and in response to the request: clearing at least a portion of the second display area by at least: automatically moving the multiple additional digital books in the second display area to the first display area; displaying the multiple additional digital books together with the digital book in the first display area; and displaying, in the second display area, a collection of pages of the digital book that have been moved by a user of the device from the first display area to the second display area.
11. A method for displaying a user interface, the method comprising: displaying a first page of a digital book in a first display area and a second page of the digital book in a second display area; receiving a first semantic zoom out request; in response to the first semantic zoom out request, displaying both the first page of the digital book and a context of the first page in the first display area, and displaying both the second page of the digital book and a context of the second page in the second display area; receiving, after receiving the first semantic zoom out request, a second semantic zoom out request; displaying, in response to the second semantic zoom out request, the digital book in the first display area and multiple additional digital books in the second display area; receiving a request to enter a scratchpad mode, and in response to the request: clearing at least a portion of the second display area by at least: automatically moving the multiple additional digital books in the second display area to the first display area; displaying the multiple additional digital books together with the digital book in the first display area; and displaying, in the second display area, a collection of pages of the digital book that have been moved by a user of the device from the first display area to the second display area. 18. A method as recited in claim 11 , further comprising: displaying, if the request to enter the scratchpad mode is received prior to receiving the second semantic zoom out request, both the first page and the context of the first page as well as both the second page and the context of the second page in the first display area.