The most mentioned books on Stack Overflow
Although not directly development related. The most impressive book I've had the pleasure of reading is "Gödel Escher Bach: An eternal golden braid" (also known as GEB) from Douglas Hofstadter.It's hard to explain what it is about exactly, but it contains ideas and concepts from mathematics, computer science, philosophy and conscience. All of it is explained in very clear and interesting way. I can recommend it to anyone interested in these topics.The book won a Pulitzer and to take a quote from the Scientific American about it: "Every few decades, an unknown author brings out a book of such depth, clarity, range, wit, beauty and originality that it is recognized at once as a major literary event."