Part of it is no longer having eighty linear feet of ten-foot high bookcases anymore, part of it is just that the Kindle is so damned convenient for most books, and Safari only slightly less so. (And it's not as if I don't visit bookstore at all -- I walked out of a used bookstore the other day with a monograph on NLP and a copy of The Grand Strategy of Phillip II, both of which were serendipitous finds.)

But there's definitely a crowding-out effect with e-books, or even Amazon's many books for a penny (plus S&H). With Amazon, I no longer have to search widely for a particular book or topic, but that also means I'm not going to randomly wander through other sections and suddenly discover buried gold. In a certain sense, I have more information about a narrow segment of the market -- the specific book I'm looking for -- but less information about the market in general.