I just finished reading a terrific essay (or short book) on the nature of operating systems and how we interact with them. The book is In the Beginning…was the Command Line by Neal Stephenson. The book was written about 10 years ago so some of the material might seem a little dated. But for those of us in the industry at the time it makes for a warm reminiscence for the good ol’ days. And if this was before your time, I think it makes for a helpful history lesson which explains a lot about where we are today. For a Neal Stephenson work, this book is exceptionally brief, but well written (you were expecting otherwise?) with more than a few illuminating metaphors.