70 expert ideas for better css coding
Smashing Magazine is a great resource for designers of all types, but the post I bookmarked was in May of 2007 titled, "70 Expert Ideas for Better CSS Coding". Some of the information is a no-brainer (but I'm big on following CSS standards and organizing… I won't let anyone else work in my CSS unless they do it the way I do): organize, use borders to identify how the setup is working, pay attention to closing all tags, etc. But some of it still surprises me, like working with EMs.
It's definitely a link I'm glad to have in my repertoire, especially when I run into a wonky problem I can't seem to solve.

