"Word search" is a very useful feature of a book reader, the closest analogue to flipping pages in a print book.
I am not of the opinion that e-books have to lavishly follow print (after all I do 70% of my e-reading on a gold letters/black background setup), so arguments like "when can you do with print books that?" are irrelevant to me.
E-books have their strengths and weaknesses, and playing upon the former is a very important factor to speed up their way into mainstream use.
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