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I use 800x1200. It looks great on the computer, Nook (my e-ink reader), Tablets, Phone, etc. etc. (Everything I have tested on).
I came to this conclusion from testing on my Nook. Larger resolutions would make the book take forever to open (I assume on even weaker hardware it would take exceedingly long), and smaller resolutions I thought looked very poor on PC, or higher resolution devices.
800x1200 seemed to be a very good midpoint, while also not making the EPUB overly large. (I aim for approximately <= 300 KB covers).
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