Methods and systems are disclosed relating to in-vehicle entertainment, information presentation, and/or processing. Aspects of multimedia in-vehicle entertainment systems that may incorporate removable and/or portable tablet-type computing devices are described. In certain configurations, a hinged tablet computer carrier includes guide rails into which a portable tablet computer may slide while in an open position, and which can hinge into a closed or locked position that holds the tablet computer in place, positions it for viewing, and effects mechanical and electrical coupling of the tablet computer with other components of the in-vehicle entertainment system. Exemplary placement could include headrest, seatback, overhead, or in-dash mounting. Hinging or sliding could be vertical or horizontal. Various other mechanical, electronic, and electro-mechanical aspects of the methods and systems are described.