BluePrint CSS is a nice, simple, and sensible CSS framework. It greatly reduces CSS development time by providing a solid base on which to extend. Really Cool!
Blueprint is a CSS framework, which aims to cut down on your CSS development time. It gives you a solid CSS foundation to build your project on top of, with an easy-to-use grid, sensible typography, and even a stylesheet for printing. http://www.blueprintcss.org/
Today I spent around 10 minutes, and used a portion of the BluePrint CSS Framework to fix some typographical problems I was having with my Wordpress theme.