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iPod touch (fourth-generation)
Yet another Apple product. I can't deny that keeping the Apple ecosystem -- hardware and software -- has made my life somewhat easier and in-sync across devices, but again it falls down to simplicity and value for what you need.
The iPod touch is my sole companion to-and-from places; that's all it's used for. My working hours often push my social life to the back-end of the day, meaning I miss out on much of the traditional television hours. I often digitally-record or catch up through on-demand services, but travelling is an ideal time to catch up on your back catalog of television.
8GB is enough: my music collection is rarely transferred in its entirety, but there is plenty of space for a good half season of television to get me through a flight or a two-hour Eurostar journey.