What Is This CSS Thing, Anyway?
http://www.cssnewbie.com/what-is-this-css-thing-anyway/

Glazebrook, Rob L.
CSSnewbie
2008

Abstract:

So you’ve been hanging around the web gurus long enough to know that 'CSS' is something big and important in the web design world. You might even know that it has something to do with making pages pretty, or more Web 2.0, or something like that. And that’s true (to an extent). But what does CSS really mean?