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Frankly, I don't think eInk is as much about the display (OLED screens can do very good black on white) but the fact that an eInk device can be used for days if not weeks on a single charge.
The convergence device currently has a major power problem. Look at the iPhone... its a phone, a PDA, a video viewer, and ebook reader. But, if you used it for most of the day other than keeping it in your pocket the battery dies before that day does.
BOb
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