Attendees or viewers of a presentation provide input marking specific points corresponding to a high level of interest. Received bookmarks are aggregated to generate overall level-of-interest values for various points in the presentation. A graphical depiction of these level-of-interest values is provided; users can navigate using this graphical depiction to find specific parts of the presentation having the highest level of interest or importance. User interface elements provide access to various filtering, display, and configuration options for the graphical depiction.