If you could only choose one CSS book for your shelf or library, which one would it be and why?

Below is some reference material to help aid in your decision

• Spring into HTML and CSS
• Beginning CSS Web Development: From Novice to Professional
• Transcending CSS: The Fine Art of Web Design
• The ZEN of CSS Design: Visual Enlightenment for the Web
• Bulletproof Web Design
• CSS Mastery: Advanced Web Standards Solutions
• Designing with Web Standards
• Web Standards Solutions

7% of my visitors use a screen resolution of 800×600 or below. My question to you is… should I drop that resolution from my next wordpress theme (which I’m about to start working on)?

I’m not sure myself. If it was less than 5% I would have for sure. But 7%?