To quote Eric Meyer, "Semantic Frameworks are a game-changer." Meta CSS frameworks like SASS, lessCSS, and xCSS are revolutionizing the way we write and manage modern, semantic CSS. With features such as variables, mixins, nested rules and operations, these meta frameworks brings us closer to writing our CSS in an unobtrusive way. They incorporate CSS frameworks such as Blueprint, Grid960, and YUI and bring together the best of grid design, CSS reset techniques and browser hacks in an unobtrusive and semantic way. Ultimately, these meta frameworks allow us to develop truly semantic websites that are not only maintainable and fun to develop. This talk with discuss CSS systems, meta frameworks, and best practices for writing unobtrusive semantic code.