RICH Weeeelllll.... this is promising, but mistargetted. Gutenberg is huge.
I'd have to agree with others that the drop shadow is awful. (If you want to make things look clickable, make buttons.) The default line length at full screen is unusable, and continuous scrolling isn't the way I like to read. I like the book covers though. Nice touch. I guess this just isn't for me.
I take a Gutenberg text, set it in a nice font, give it a sensibly short line length (just like a real book!), and print to PDF, then read it in Acrobat with facing pages on my widescreen Mac. Slightly more involved, but hey it's worth it because my library's bigger than your library...
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