For every promising concept we see, theres one that gets scrapped before ever making it to market. Thats what happened with Acers Extend dock, an accessory that would have allowed you to connect your smartphone to a clamshell-style dock with a display, keyboard and a spare battery to recharge your handset. Turns out, lots of people already carry laptops, and dont necessarily need to transform their phones into a de facto tablet or netbook.