These books help you to get a birds-eye view of UX design.
Don't Make Me Think: A Common Sense Approach to Web Usability
This book is an excellent introduction to both the benefits and principles of good design. If you read this book, and put everything it says into practice, you'll already be off to a good start.
The Elements of User Experience: User-Centered Design for the Web and Beyond
This book takes a more theoretical approach to what User Experience design is than Don't Make Me Think. Jesse defines the layers that make up the profession, and how they're connected.
Universal Principles of Design: 125 Ways to Enhance Usability, Influence Perception, Increase Appeal, Make Better Design Decisions, and Teach through Design
A practical book through and through, this is a great reference. You'll learn principles that will stick with you for your entire career. Each principle is given two pages, so you can easily flip to any point in the book and learn something interesting.