At that same Arcade Fire concert, a guy in front of me held his camera phone towards the big screen that flanked the stage and hit the video record button.

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The glasses can record and stream video and display information via a transparent screen just above the wearer's usual line of sight.

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Up to 48 kids recreate the dances displayed on a large screen, while sensors in the wireless dance platforms record data about how well they are doing.

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Someone watching a cable series at a friend's house can finish the program at home or on their mobile device, schedule their DVR to record an episode, even record the full season, just by sampling the screen for a second or two.

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Update : It's a 1, 280 x 720 screen at 294 dpi, for the record.

ENGADGET

The X-ray machines that screen passenger baggage have a patchy record.

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Hugely sophisticated, it can collect files on a machine, take screen shots, and even activate the microphone on a computer to record conversations.

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You can easily capture screen grabs using the stylus to mark out the grab area, and you can even record video of your onscreen activity.

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