Topic: Factor CSS - reveals shared components, often producing smaller CSS
I tested this tool (http://zamez.org/factorcss). It seemed to do a remarkable job in grouping CSS commands and reducing code. Pun's forum_base.css code, for example, went from 405 lines to 62. The code was readable, but definitely grouped and compacted.
It may be good to develop your CSS as you do normally; test it and refine it to the point you like it; then run it through this process for the final, stored/used version.