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Smashing Magazine has an absolutely wonderful list of CSS techniques vital for any web programmer.

This blog post provides a few simple tricks for coding efficient stylesheets — in the sense of having an organised structure which is easy to navigate and to modify. The color grouping seems like the most useful tip.

BarelyFitz Design has written up a very nice explainer on how to position elements through CSS. Their step four is probably the one that is most easily forgotten: Combining position:relative with position:absolute. In a nutshell, setting a ‘relative’ position on the container element will allow you to position subelements absolutely within that element. And the explainer goes to show how this method can be used for two- or three-column layouts that rival the traditional methods of floating elements.