Might be a bit off-topic, but here it goes. This article gave me reassurance how I resisted using e-readers and stuck to the notion of using an actual book. Waste of paper? Yes. But then we are wasting papers in many other ways as well (another debate). Plus books hardly get recycled and they often get passed on (used bookstores). Also, my another issue with Kindle-esque books or even buying paperbacks from Amazon is…
Even so - I like an e-reader for certain uses. The best use that I've found is for technical documents. Not books, per se, but documentation like electronic component datasheets and the like are much more convenient to access on an e-reader, especially when you're in the middle of a project. Before, one would have to spend a lot of money to get the datasheets in book form from the manufacturer, and then find a place to store the behemoths (some were as thick as phone books, and multi-volume - especially components and such from places like Motorola, ST, and others with extensive component lines). Not only that, each year (or more often) you'd have to get the new versions for the year, and the various errata pages (filed somewhere). Then to search thru all of that...
...today, I can download and read these documents online or offline with a reader, store them locally, search them fairly easily, etc. All on a small and easy to use electronic device.