What is the best book/resource for CSS? (more than the basics)

I am looking for something like the quality equivalent of Agile Web Development with Rails, but for CSS.

O'Reilly's CSS Cookbook is a pretty good book. Again, that's the only CSS book I have, so I don't know how it compares to others. However, this book was recommended to me by almost every person. I'm not sure if the book contains the advanced CSS programming you desire.

Email me if you want it.

Why don't you try this website http://www.cssplay.co.uk/ they're usually doing the most cutting edge of experiments in CSS.