As common and well-known as CSS is, it has its shortcomings.
So much so that developers are beginning to create tooling around the language in order to give it features that most programming languages actually have. Compass is a pretty slick utility that helps to author stylesheets using Sass.
It works on Windows, Linux, and Mac OSX:
http://www.youtube.com/watch?v=pFCYhy9N6co
You can read more information here.
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