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Designing Web Usability
Steve Krug: Don't Make Me Think!: A Common Sense Approach to Web Usability
Jakob Nielsen - Usability writing for the web
Don't Make Me Think: A Common Sense Approach to Web Usability by Steve Krug
Web App Success
Design Web Usability
Hardboiled Web Design
Simple and Usable
Web Application Design Patterns (Pawan Vora) ; full of ui and ux patterns for web apps - think pattern library
Neuro Web Design: What Makes Them Click?