What I currently like about my e-ink readers is the battery life, size of screen, and expansion capability. It is also nice having wi-fi access. I think the next big jump that would have me salivating would be a nice color e-ink screen. Now, I get that most readers don't need more than B&W to read, but it would be nice to view the book cover the way it is meant to be viewed, as well as the occasional embeded pictures that really need color to see it right. Also, magazines and newsletters may be more attractive in color.
Ohhh, and a folding ebook so that 2 screens face each other but fold flat like a real book.... might be a good idea.
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