E-reader manufacturers are doing their darnedest to get their devices to behave more like the old fashioned books we've all since abandoned, but we won't be happy until we can roll one up and stuff it in our back pockets, paperback-style. Sony's working hard to make that dream a reality -- the company showed off some new bendable display technology behind closed doors at last week's SID conference in LA, including a color unit and the extremely flexible black and white e-paper display seen above, which can be bent to a 5mm curvature r