The following are some of my favorite books about web design - and more specifically - thinking about UX beyond wireframes.
Utopian Entrepreneur | Brenda Laurel
Two words: signed copy. She's my hero.
A Web for Everyone: Designing Accessible User Experiences | Sarah Horton & Whitney Quesenbery
A website isn't usable if everyone can't use it. Also: the personas will change the way you think about people with disabilities.
Observing the User Experience | Mike Kuniavsky
The ultimate handbook for user research, contextual inquiry, and usability testing. An excellent companion book is Measuring the User Experience by Tullis and Albert.
Content Strategy for the Web | Kristina Halvorson
She gave credibility to what hundreds of writers, webmasters and user experience folks were toiling at in the background for years, making content strategist or content manager a "real" job.
Search Analytics for Your Site: Conversations with Your Customers | Lou Rosenfeld
Another hands-on pick, but FINALLY someone tells the UX field how to use site search analytics for the betterment of society.
Employees First, Customers Second | Vineet Nayar
Who is first in your company? It's a knowledge economy, and after reading this, you'll realize what so many agencies and corporations are doing wrong.
HTML & CSS: Design and Build Websites | Jon Duckett
This book makes HTML and CSS easy for maintaining little websites like mine, or for trying your hand at UX prototyping with "real" code. It's a beautiful book that was written with its beginner audience in mind.