Here are some recommended User Experience Books.
Rocket Surgery Made Easy: The Do-it-yourself Guide to Finding and Fixing Usability Problems Steve Krug
This book provides a great introduction to user research and user testing. It puts the user back into user experience.
The Design of Everyday Things
This book inspired the creation of Google and has been a corner stone for approaching user centered design problems.
The Inmates Are Running the Asylum (2nd Edition) This is a polemic against the issues with technical lead software developement. The issues in this book still ring true today.
About Face: The Essentials of Interaction Design
This is the forth edition of this seminal book on interaction design, a key part of user experience.
Information Architecture for the World Wide Web
Don't Make Me Think!: A Common Sense Approach to Web Usability
Elements of User Experience: User-centered Design for the Web