Well pasting the text of an email or book is hardly going to be worth the effort. As for copy and pasting a book into it. You can have PhotoRead the material a whole lot faster. So I don't see this one all that practical with its 1024 message limit.
A program that would flash a page per second or faster yes it would work. Acrobat already does this although at a page per second it's a tad slow for my liking but you don't have to muck around putting the text into another program so even if I wanted hands free PhotoReading it's a darn sight faster using Acrobat than copy and pasting the stuff into something else.
Alex