Shawn Wildermuth has just published a new course: A Better CSS: LESS and SASS

CSS is a great way to separate your design and markup during HTML development, but there are key pain points that make it more difficult than it should be. Dynamic stylesheet languages like LESS and SASS can make style sheets more readable, maintainable, and easier to write. This course dives into both LESS and SASS and shows you how powerful these                 languages can be.