1. A computer-implemented method comprising: under control of one or more computing devices configured with specific computer executable instructions, causing output of a first portion of a plurality of portions of digital content via a computing device, wherein the digital content corresponds to physical content; causing a user perceptible cue source to output a user perceptible cue on the physical content at a first position in the physical content corresponding to the first portion of the digital content; and maintaining synchronous output of the digital content and the user perceptible cue on the physical content based at least in part on content synchronization information that associates each portion of the plurality of portions of the digital content with a respective position in the physical content.
1. A computer-implemented method comprising: under control of one or more computing devices configured with specific computer executable instructions, causing output of a first portion of a plurality of portions of digital content via a computing device, wherein the digital content corresponds to physical content; causing a user perceptible cue source to output a user perceptible cue on the physical content at a first position in the physical content corresponding to the first portion of the digital content; and maintaining synchronous output of the digital content and the user perceptible cue on the physical content based at least in part on content synchronization information that associates each portion of the plurality of portions of the digital content with a respective position in the physical content. 2. The computer-implemented method of claim 1 , wherein maintaining synchronous output of the digital content and the user perceptible cue on the physical content comprises: causing output of a second portion of the plurality of portions of the digital content; and causing the user perceptible cue source to output the user perceptible cue on the physical content at the respective position in the physical content that is associated, by the content synchronization information, with the second portion of the digital content.