Each of the chapters in this book ends with a suggested-reading list. At the risk of some repetition, here are the books I feel make up a good basic library for anyone seriously interested in product design, service design, website design, user-experience design, and related fields.
Measuring the User Experience: Collecting, Analyzing, and Presenting Usability Metrics, Tom Tullis and Bill Albert, Morgan Kaufmann, 2008
Search Analytics for Your Site: Conversations with Your Customers, Louis Rosenfeld, Rosenfeld, 2011
Social Media Metrics: How to Measure and Optimize Your Marketing Investment, Jim Sterne, Wiley, 2010
Social Media ROI: Managing and Measuring Social Media Efforts in Your Organization, Olivier Blanchard, Que, 2011
Web Analytics an Hour a Day, Avinash Kaushik, Sybex, 2007
100 Things Every Designer Needs to Know About People, Susan M. Weinschenk, New Riders, 2011
How We Decide, Jonah Lehrer, Mariner, 2009
Irrationality, Stuart Sutherland, Constable and Co., 1992
A Mind of Its Own: How Your Brain Distorts and Deceives, Cordelia Fine, Icon, 2005
Neuro Web Design: What Makes Them Click, Susan M. Weinschenk, New Riders, 2009
Persuasive Technology: Using Computers to Change What We Think and Do, B.J. Fogg, Morgan Kaufmann, 2003
Predictably Irrational: The Hidden Forces That Shape Our Decisions, Dan Ariely, HarperCollins, 2009
Clout: The Art and Science of Influential Web Content, Colleen Jones, New Riders, 2011
Killer Web Content: ...