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The first folding e-reader is smaller than a paperback
(www.theverge.com)
This is a most excellent place for technology news and articles.
I got a kobo recently and like it a lot. I got the sage because the screen is about the size of a manga page, which I knew I would be reading a lot of. I keep it in airplane mode most of the time and use Calibre to load it up. The system works well for me