##Articles
An Introduction To Object Oriented CSS (OOCSS)
Great intro from Smashing Magazine on the topic of OOCSS. On the topic of a multi-class approach to declaring styles:
Some may feel that this type of styles abstraction clutters the HTML and goes against the principle of separating markup from presentation.
But putting aside any debates about how this might affect the markup, no one can question that this abstraction has now made it easier to track down and modify the common styles that are used to structure these three elements.
About HTML Semantics and Front-End Architecture
by Nicolas Gallagher. I love this article so much -- it says it all (IMO) perectly. Amongst other things, great talk about semantics as well as why he prefers a multi-class approach vs. that of @extend.