The Elements of User Experience: User-Centered Design for the Web

Jesse James Garrett. This small book succinctly and professionally explains the entire user-experience field. Every page has some insight to offer; from user-centred strategy to visual branding and graphics. For more information see jjg.net.
amazon.co.uk / amazon.com

Art as Experience

John Dewey. A classic book written in the 1930s. Read the chapter ‘What is an experience’ for the most astute and intelligent discussion of what makes our world of experience.
amazon.co.uk / amazon.com

Experience and Nature

John Dewey.
amazon.co.uk / amazon.com

Experience Design

Nathan Shedroff. Diverse and interesting examples of design being used to shape our experiences. A very poorly designed book.
amazon.co.uk / amazon.com

Flow: The Psychology of Optimal Experience

Mihaly Csikszentmihalyi.
amazon.co.uk / amazon.com

A Natural History of the Senses

Diane Ackerman.
amazon.co.uk / amazon.com

The Shape of Content

Ben Shahn.
amazon.co.uk / amazon.com

British Rail Design

James Cousins. Out of print. A fascinating overview of the complete British Rail user-experience, from the fabric for the seat covers, to carriage design, to signage and pedestrian density in stations.
Danish Design Centre / UK booksearch.