Although I agree that being solar powered has me wondering how well the device will work, I must say it's a good idea. This should attract the "green-minded" customers out there. After all if I recall correctly weren't ebook readers once being advertised as being green, in addition to using little energy? The Papyrus is just trying to make it fully green
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Also having the device solar powered should eliminate the need to replace batteries in the future. So it should reduce some of its customer service requirements and costs. This should also attract more international customers.
So to me the general idea of a solar powered device is cool. We'll see how well it works when the Papyrus is released.