CSS Principles
NETTUTS just published a great article on 10 Principles used by the Masters of CSS. I particularly agree with the first two.
1. In CSS the simple solution is usually the best. I can’t tell you how many times I’ve thrown away chunks of code after realizing there was a much more straightforward method.
2. Keep declarations on one line. Many may disagree with this but when dealing with large stylesheets having your declarations on one line makes it easier find things. It also cuts down on file size.