One of the quintessential works on user experience - although its a bit web-focused from today's perspective. Many of the core concepts in the book are also basic 101 for any web developer/designer, so it might not be as insightful as it once was. But I still enjoy reading it every now and then.

"Don't make me think" is a must read book for anyone who works for products.

I have not read this book yet. It seems to be a favorite amongst UX designers and developers. Interested to hear some other opinions from people that have read it.