A simple basic introduction to people new to CSS. If you're still using tables for most of your work, then this is a great book to start with as you transition to CSS.
Pretty pictures, but not enough practical design substance for "real" sites. Some of the main content bodies are so narrow, you would never get a decent grid result in there. Good conceptual ideas though, for those brain-dead times when you need a jumpstart. Geared towards designers, rather than programmers.
The Rails bible as we know it.