A structure file defines a hierarchical structure and a plurality of content files each define at least one digital content item. Each content file can be related to a position within the hierarchical structure, thereby organizing the content files into the hierarchical structure. To present categories and digital content items rapidly, categories are read from the structure file and are mapped to areas on a display. A location on the display is received and a category corresponding to the received location is displayed. After a category is selected, second files corresponding to the selected category are mapped to areas on the display. A location on the display is received and at least one digital content item of the second file corresponding to the received location is displayed.