When Douglas County (Colorado) Libraries decided to put "Buy this book" buttons on their online catalog pages (example), the response was strong. In just 11 days, the buy buttons had garnered almost 700 clickthroughs. According to Library Director Jamie LaRue, the library is putting buy links direct to publisher-supplied urls when they are provided (often to Barnes and Noble). Of the 700 clickthroughs, 389 went to Amazon and 262 to Tattered Cover, the independent bookstore with 3 locations in the Denver area. In isolation, this data seems to be strong support for the notion that a digital presence in libraries can support sales of books. The withdrawal this week by Penguin from library ebook lending platforms (such as Overdrive) would seem to be a profoundly shortsighted move.