CSS Preprocessors are been used more and more nowadays. My preferred choice is SASS and not only because of the fact it's the default Rails preprocessor, but I like the syntax and the functionality. Although it is less like CSS than Less it is easier to understand. All of the CSS I write now days is normally written with the Aid of SASS. Over the years of using it, I have learned techniques and methodologies to allow me to organize my code and take advantage of SASS's advanced features.