12. A mobile computing system, comprising: a processor; a touch screen display for displaying paginated digital content to a user and allowing user input; and a user interface executable on the processor and including a fixed format viewing mode, wherein in response to an annotation provided on a given page of the paginated digital content, content of the given page becomes fixed, such that if the paginated digital content is reflowed, the content of the given page stays fixed and does not reflow, and content of at least one other page of the paginated digital content having no annotation is changed; wherein a reflow of the paginated digital content is performed in response to a change to at least one of a content viewing setting and a formatting characteristic of the paginated digital content; and wherein in response to the reflow of the paginated digital content, content on at least one page adjacent to the given page includes redundant content also included on the given page, and wherein the redundant content on the at least one adjacent page is visually different from non-redundant content.
12. A mobile computing system, comprising: a processor; a touch screen display for displaying paginated digital content to a user and allowing user input; and a user interface executable on the processor and including a fixed format viewing mode, wherein in response to an annotation provided on a given page of the paginated digital content, content of the given page becomes fixed, such that if the paginated digital content is reflowed, the content of the given page stays fixed and does not reflow, and content of at least one other page of the paginated digital content having no annotation is changed; wherein a reflow of the paginated digital content is performed in response to a change to at least one of a content viewing setting and a formatting characteristic of the paginated digital content; and wherein in response to the reflow of the paginated digital content, content on at least one page adjacent to the given page includes redundant content also included on the given page, and wherein the redundant content on the at least one adjacent page is visually different from non-redundant content. 13. The system of claim 12 wherein an annotation can only be made on the touch screen display using a stylus.