I picked up Eric Meyer On CSS today. From what I’ve read so far it is a very impressive presentation of intermidiate to advanced uses of CSS. Each chapter is a “project” that Eric takes the reader through. He states the goals of the project and then in a very understandable fashion executes those goals. There is a companion site which provides additional resources and updates.
CSS is a facinating technology that very few people have begun to scratch the surface of. With books like this, and authors like Eric, the rest of the web will become aquainted with the power of this styling language.