Here's a list of UX (User Experience) design books that I highly recommend.

About Face

by Alan Cooper

One of the classics of UX Design. The tone is a bit pedantic at times and a bit of a slog but ti's worth reading.

Sketching User Experiences

by Bill Buxton

Provides interesting case studies and approaches towards prototyping, wireframing and all around development.

Designing Interafces

by Jennifer Tidwell

A collection of common design pattern solutions

Designing the Obvious

by Robert Hoekman

He advocates a Situational Design approach as opposed to a Persona based approach, which I have a tendency to agree with.

Rocket Surgery made Easy

by Steve Krug

Short, simple, sweet book for usability testing on a budget.

Dont' Make Me Think

by Steve Krug

Krug's classic. This time on UX do's and don'ts.

A Project Guide to UX Design

by Russ Unger and Carolyn Chandler

A good general overview to UX.

The Design of Everyday Things

by Donald Norman

A classic in interface design. Covers not just digital design but real world "interfaces" as well.

Emotional Design: Why We Love (or Hate) Everyday Things

by Donald Norman

Another classic by Norman. This time addressing the emotional logic of users and how it applies to good or bad design.

Designing Interactions

by Bill Moggridge

A wonderful overview of the history of interaction design. Despite its many pages, a quick and easily digestible read with lots of case studies and interviews.