> Once expansive touchscreens are cheap, of course, we can display a virtual wall of bookshelves and instantly load a text on the device of choice, or even prin

> Once expansive touchscreens are cheap, of course, we can display a virtual wall of bookshelves and instantly load a text on the device of choice, or even print on demand. This is exactly what I had in mind when reading some of the comments. "Discoverability and serendipity", as DanBC pointed out is fixable by this technology. But you don't need huge touchscreens. A medium-sized one (55"?) with something like Cover Flow, where different books slowly move across the screen might be a pretty good solution.