I don't know if you are already aware of LESS. If not, you will probably find it quite interesting. In fact if you're programming using CSS a lot, LESS is a powerful add on which will make things easier for you.
"LESS extends CSS with dynamic behavior such as variables, mixins, operations and functions. LESS runs on both the client-side (Chrome, Safari, Firefox) and server-side, with Node.js and Rhino"If you are intrigued by LESS and don't know about it already, please follow me...