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For a personal device I think touch screen is more important, but folding/rolling would also be useful - it would be really nice to be able to open the enotepad and get twice the display area. The cellphone that folds out an e-ink display is quite cool in that respect, it's just tiny. Give me a Sony Reader that unfolds to twice as wide as the current device and I'd be much happier. The problem would be finding a way to make it usable when folded too, which might mean wrapping the display around the outside when it is folded.
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