It’s not a design-pattern book but focused on solely on user interfaces.
Patterns for Effective Interaction Design (2nd Edition)
New edition focuses on designing interfaces for mobile.
Designing Web Interfaces
Principals and Practices for Rich Interactions
Designing sites that are easy to use is still a challenge because the challenge is only partly technical.
The Principles of Beautiful Web Design
From Colour Picking to Layout to Typography, a Step-By-Step Guide to Creating Good Looking Websites.
Neuro Web Design
What Makes Them Click?
Before Starting on Your Next Website, Put Your Customer on the Couch; A Little Psychology Can Lead to More Effective Web Sites.