1. An electronic device, comprising: a display for presenting paginated digital content to a user; and a user interface including an annotation mode, the annotation mode including multiple note types for paginated digital content, the note types comprising: i) a sticky note that can be created in response to a tap or mouse click or selection made on the paginated digital content when the annotation mode is invoked, wherein the sticky note is represented by a movable graphic and selection of the graphic causes contents of the sticky note to be presented; and ii) a margin note that can be created by converting a previously created sticky note to a margin note, wherein contents of the margin note are always presented and the margin note is configured to be placed anywhere on the paginated digital content.