Ratio, brilliant new cookbook by Michael Ruhlman

Ratio: The Simple Codes Behind the Craft of Everyday Cooking [$16.20] by Michael Ruhlman is a new cooking reference book that will be getting a lot of use in our kitchen. Instead of laying out recipes, Ratio deals in the fundamental building blocks--the ratios between main ingredients. Bread is 5 parts flour, 3 parts water. There are lots of other variables (yeast, salt, fats, kneading, cooking temp, etc), but the fundamental essence of bread is the ratio of flour to water. Ruhlman gives you the ratio and an example recipe with measurements, but also ideas for lots of variation.