OK, you're the young, mould-breaking, rockstar president of the US of A. You're on a visit to Britain that features (among other stuff) tea at Buck House, your first ever encounter with Her Maj. You've already been chastised, and not in a kind way, by the British press for presenting their prime minister with a gift of 25 Great American Movies on DVDs that may or may not have been compatible with British machinery. So now what do you give their octogenarian monarch who, you can safely assume, already has everything she could ever want? An iPod, of course. Engraved,...